fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         err = security_dentry_init_security(dentry, sattr->ia_mode,
 126                                 &dentry->d_name, NULL,
 127                                 (void **)&label->label, &label->len);
 128         if (err == 0)
 129                 return label;
 130
 131         return NULL;
 132 }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 {
 136         if (label)
 137                 security_release_secctx(label->label, label->len);
 138 }
 139 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 140 {
 141         if (label)
 142                 return server->attr_bitmask;
 143
 144         return server->attr_bitmask_nl;
 145 }
 146 #else
 147 static inline struct nfs4_label *
 148 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 149         struct iattr *sattr, struct nfs4_label *l)
 150 { return NULL; }
 151 static inline void
 152 nfs4_label_release_security(struct nfs4_label *label)
 153 { return; }
 154 static inline u32 *
 155 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 156 { return server->attr_bitmask; }
 157 #endif
 158
 159 /* Prevent leaks of NFSv4 errors into userland */
 160 static int nfs4_map_errors(int err)
 161 {
 162         if (err >= -1000)
 163                 return err;
 164         switch (err) {
 165         case -NFS4ERR_RESOURCE:
 166         case -NFS4ERR_LAYOUTTRYLATER:
 167         case -NFS4ERR_RECALLCONFLICT:
 168                 return -EREMOTEIO;
 169         case -NFS4ERR_WRONGSEC:
 170         case -NFS4ERR_WRONG_CRED:
 171                 return -EPERM;
 172         case -NFS4ERR_BADOWNER:
 173         case -NFS4ERR_BADNAME:
 174                 return -EINVAL;
 175         case -NFS4ERR_SHARE_DENIED:
 176                 return -EACCES;
 177         case -NFS4ERR_MINOR_VERS_MISMATCH:
 178                 return -EPROTONOSUPPORT;
 179         case -NFS4ERR_FILE_OPEN:
 180                 return -EBUSY;
 181         case -NFS4ERR_NOT_SAME:
 182                 return -ENOTSYNC;
 183         default:
 184                 dprintk("%s could not handle NFSv4 error %d\n",
 185                                 __func__, -err);
 186                 break;
 187         }
 188         return -EIO;
 189 }
 190
 191 /*
 192  * This is our standard bitmap for GETATTR requests.
 193  */
 194 const u32 nfs4_fattr_bitmap[3] = {
 195         FATTR4_WORD0_TYPE
 196         | FATTR4_WORD0_CHANGE
 197         | FATTR4_WORD0_SIZE
 198         | FATTR4_WORD0_FSID
 199         | FATTR4_WORD0_FILEID,
 200         FATTR4_WORD1_MODE
 201         | FATTR4_WORD1_NUMLINKS
 202         | FATTR4_WORD1_OWNER
 203         | FATTR4_WORD1_OWNER_GROUP
 204         | FATTR4_WORD1_RAWDEV
 205         | FATTR4_WORD1_SPACE_USED
 206         | FATTR4_WORD1_TIME_ACCESS
 207         | FATTR4_WORD1_TIME_METADATA
 208         | FATTR4_WORD1_TIME_MODIFY
 209         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 210 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 211         FATTR4_WORD2_SECURITY_LABEL
 212 #endif
 213 };
 214
 215 static const u32 nfs4_pnfs_open_bitmap[3] = {
 216         FATTR4_WORD0_TYPE
 217         | FATTR4_WORD0_CHANGE
 218         | FATTR4_WORD0_SIZE
 219         | FATTR4_WORD0_FSID
 220         | FATTR4_WORD0_FILEID,
 221         FATTR4_WORD1_MODE
 222         | FATTR4_WORD1_NUMLINKS
 223         | FATTR4_WORD1_OWNER
 224         | FATTR4_WORD1_OWNER_GROUP
 225         | FATTR4_WORD1_RAWDEV
 226         | FATTR4_WORD1_SPACE_USED
 227         | FATTR4_WORD1_TIME_ACCESS
 228         | FATTR4_WORD1_TIME_METADATA
 229         | FATTR4_WORD1_TIME_MODIFY,
 230         FATTR4_WORD2_MDSTHRESHOLD
 231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 232         | FATTR4_WORD2_SECURITY_LABEL
 233 #endif
 234 };
 235
 236 static const u32 nfs4_open_noattr_bitmap[3] = {
 237         FATTR4_WORD0_TYPE
 238         | FATTR4_WORD0_FILEID,
 239 };
 240
 241 const u32 nfs4_statfs_bitmap[3] = {
 242         FATTR4_WORD0_FILES_AVAIL
 243         | FATTR4_WORD0_FILES_FREE
 244         | FATTR4_WORD0_FILES_TOTAL,
 245         FATTR4_WORD1_SPACE_AVAIL
 246         | FATTR4_WORD1_SPACE_FREE
 247         | FATTR4_WORD1_SPACE_TOTAL
 248 };
 249
 250 const u32 nfs4_pathconf_bitmap[3] = {
 251         FATTR4_WORD0_MAXLINK
 252         | FATTR4_WORD0_MAXNAME,
 253         0
 254 };
 255
 256 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 257                         | FATTR4_WORD0_MAXREAD
 258                         | FATTR4_WORD0_MAXWRITE
 259                         | FATTR4_WORD0_LEASE_TIME,
 260                         FATTR4_WORD1_TIME_DELTA
 261                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 262                         FATTR4_WORD2_LAYOUT_BLKSIZE
 263                         | FATTR4_WORD2_CLONE_BLKSIZE
 264                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 265                         | FATTR4_WORD2_XATTR_SUPPORT
 266 };
 267
 268 const u32 nfs4_fs_locations_bitmap[3] = {
 269         FATTR4_WORD0_CHANGE
 270         | FATTR4_WORD0_SIZE
 271         | FATTR4_WORD0_FSID
 272         | FATTR4_WORD0_FILEID
 273         | FATTR4_WORD0_FS_LOCATIONS,
 274         FATTR4_WORD1_OWNER
 275         | FATTR4_WORD1_OWNER_GROUP
 276         | FATTR4_WORD1_RAWDEV
 277         | FATTR4_WORD1_SPACE_USED
 278         | FATTR4_WORD1_TIME_ACCESS
 279         | FATTR4_WORD1_TIME_METADATA
 280         | FATTR4_WORD1_TIME_MODIFY
 281         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 282 };
 283
 284 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 285                                     struct inode *inode, unsigned long flags)
 286 {
 287         unsigned long cache_validity;
 288
 289         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 290         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 291                 return;
 292
 293         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 294
 295         /* Remove the attributes over which we have full control */
 296         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 297         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 298                 dst[0] &= ~FATTR4_WORD0_SIZE;
 299
 300         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 301                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 302
 303         if (!(cache_validity & NFS_INO_INVALID_MODE))
 304                 dst[1] &= ~FATTR4_WORD1_MODE;
 305         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 306                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 307 }
 308
 309 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 310                 struct nfs4_readdir_arg *readdir)
 311 {
 312         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 313         __be32 *start, *p;
 314
 315         if (cookie > 2) {
 316                 readdir->cookie = cookie;
 317                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 318                 return;
 319         }
 320
 321         readdir->cookie = 0;
 322         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 323         if (cookie == 2)
 324                 return;
 325
 326         /*
 327          * NFSv4 servers do not return entries for '.' and '..'
 328          * Therefore, we fake these entries here.  We let '.'
 329          * have cookie 0 and '..' have cookie 1.  Note that
 330          * when talking to the server, we always send cookie 0
 331          * instead of 1 or 2.
 332          */
 333         start = p = kmap_atomic(*readdir->pages);
 334
 335         if (cookie == 0) {
 336                 *p++ = xdr_one;                                  /* next */
 337                 *p++ = xdr_zero;                   /* cookie, first word */
 338                 *p++ = xdr_one;                   /* cookie, second word */
 339                 *p++ = xdr_one;                             /* entry len */
 340                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 341                 p++;
 342                 *p++ = xdr_one;                         /* bitmap length */
 343                 *p++ = htonl(attrs);                           /* bitmap */
 344                 *p++ = htonl(12);             /* attribute buffer length */
 345                 *p++ = htonl(NF4DIR);
 346                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 347         }
 348
 349         *p++ = xdr_one;                                  /* next */
 350         *p++ = xdr_zero;                   /* cookie, first word */
 351         *p++ = xdr_two;                   /* cookie, second word */
 352         *p++ = xdr_two;                             /* entry len */
 353         memcpy(p, "..\0\0", 4);                         /* entry */
 354         p++;
 355         *p++ = xdr_one;                         /* bitmap length */
 356         *p++ = htonl(attrs);                           /* bitmap */
 357         *p++ = htonl(12);             /* attribute buffer length */
 358         *p++ = htonl(NF4DIR);
 359         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 360
 361         readdir->pgbase = (char *)p - (char *)start;
 362         readdir->count -= readdir->pgbase;
 363         kunmap_atomic(start);
 364 }
 365
 366 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 367 {
 368         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 369                 fattr->pre_change_attr = version;
 370                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 371         }
 372 }
 373
 374 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 375                 nfs4_stateid *stateid,
 376                 const struct cred *cred)
 377 {
 378         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 379
 380         ops->test_and_free_expired(server, stateid, cred);
 381 }
 382
 383 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 384                 nfs4_stateid *stateid,
 385                 const struct cred *cred)
 386 {
 387         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 388         nfs4_test_and_free_stateid(server, stateid, cred);
 389 }
 390
 391 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 392                 const nfs4_stateid *stateid,
 393                 const struct cred *cred)
 394 {
 395         nfs4_stateid tmp;
 396
 397         nfs4_stateid_copy(&tmp, stateid);
 398         __nfs4_free_revoked_stateid(server, &tmp, cred);
 399 }
 400
 401 static long nfs4_update_delay(long *timeout)
 402 {
 403         long ret;
 404         if (!timeout)
 405                 return NFS4_POLL_RETRY_MAX;
 406         if (*timeout <= 0)
 407                 *timeout = NFS4_POLL_RETRY_MIN;
 408         if (*timeout > NFS4_POLL_RETRY_MAX)
 409                 *timeout = NFS4_POLL_RETRY_MAX;
 410         ret = *timeout;
 411         *timeout <<= 1;
 412         return ret;
 413 }
 414
 415 static int nfs4_delay_killable(long *timeout)
 416 {
 417         might_sleep();
 418
 419         freezable_schedule_timeout_killable_unsafe(
 420                 nfs4_update_delay(timeout));
 421         if (!__fatal_signal_pending(current))
 422                 return 0;
 423         return -EINTR;
 424 }
 425
 426 static int nfs4_delay_interruptible(long *timeout)
 427 {
 428         might_sleep();
 429
 430         freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
 431         if (!signal_pending(current))
 432                 return 0;
 433         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 434 }
 435
 436 static int nfs4_delay(long *timeout, bool interruptible)
 437 {
 438         if (interruptible)
 439                 return nfs4_delay_interruptible(timeout);
 440         return nfs4_delay_killable(timeout);
 441 }
 442
 443 static const nfs4_stateid *
 444 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 445 {
 446         if (!stateid)
 447                 return NULL;
 448         switch (stateid->type) {
 449         case NFS4_OPEN_STATEID_TYPE:
 450         case NFS4_LOCK_STATEID_TYPE:
 451         case NFS4_DELEGATION_STATEID_TYPE:
 452                 return stateid;
 453         default:
 454                 break;
 455         }
 456         return NULL;
 457 }
 458
 459 /* This is the error handling routine for processes that are allowed
 460  * to sleep.
 461  */
 462 static int nfs4_do_handle_exception(struct nfs_server *server,
 463                 int errorcode, struct nfs4_exception *exception)
 464 {
 465         struct nfs_client *clp = server->nfs_client;
 466         struct nfs4_state *state = exception->state;
 467         const nfs4_stateid *stateid;
 468         struct inode *inode = exception->inode;
 469         int ret = errorcode;
 470
 471         exception->delay = 0;
 472         exception->recovering = 0;
 473         exception->retry = 0;
 474
 475         stateid = nfs4_recoverable_stateid(exception->stateid);
 476         if (stateid == NULL && state != NULL)
 477                 stateid = nfs4_recoverable_stateid(&state->stateid);
 478
 479         switch(errorcode) {
 480                 case 0:
 481                         return 0;
 482                 case -NFS4ERR_BADHANDLE:
 483                 case -ESTALE:
 484                         if (inode != NULL && S_ISREG(inode->i_mode))
 485                                 pnfs_destroy_layout(NFS_I(inode));
 486                         break;
 487                 case -NFS4ERR_DELEG_REVOKED:
 488                 case -NFS4ERR_ADMIN_REVOKED:
 489                 case -NFS4ERR_EXPIRED:
 490                 case -NFS4ERR_BAD_STATEID:
 491                 case -NFS4ERR_PARTNER_NO_AUTH:
 492                         if (inode != NULL && stateid != NULL) {
 493                                 nfs_inode_find_state_and_recover(inode,
 494                                                 stateid);
 495                                 goto wait_on_recovery;
 496                         }
 497                         fallthrough;
 498                 case -NFS4ERR_OPENMODE:
 499                         if (inode) {
 500                                 int err;
 501
 502                                 err = nfs_async_inode_return_delegation(inode,
 503                                                 stateid);
 504                                 if (err == 0)
 505                                         goto wait_on_recovery;
 506                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 507                                         exception->retry = 1;
 508                                         break;
 509                                 }
 510                         }
 511                         if (state == NULL)
 512                                 break;
 513                         ret = nfs4_schedule_stateid_recovery(server, state);
 514                         if (ret < 0)
 515                                 break;
 516                         goto wait_on_recovery;
 517                 case -NFS4ERR_STALE_STATEID:
 518                 case -NFS4ERR_STALE_CLIENTID:
 519                         nfs4_schedule_lease_recovery(clp);
 520                         goto wait_on_recovery;
 521                 case -NFS4ERR_MOVED:
 522                         ret = nfs4_schedule_migration_recovery(server);
 523                         if (ret < 0)
 524                                 break;
 525                         goto wait_on_recovery;
 526                 case -NFS4ERR_LEASE_MOVED:
 527                         nfs4_schedule_lease_moved_recovery(clp);
 528                         goto wait_on_recovery;
 529 #if defined(CONFIG_NFS_V4_1)
 530                 case -NFS4ERR_BADSESSION:
 531                 case -NFS4ERR_BADSLOT:
 532                 case -NFS4ERR_BAD_HIGH_SLOT:
 533                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 534                 case -NFS4ERR_DEADSESSION:
 535                 case -NFS4ERR_SEQ_FALSE_RETRY:
 536                 case -NFS4ERR_SEQ_MISORDERED:
 537                         /* Handled in nfs41_sequence_process() */
 538                         goto wait_on_recovery;
 539 #endif /* defined(CONFIG_NFS_V4_1) */
 540                 case -NFS4ERR_FILE_OPEN:
 541                         if (exception->timeout > HZ) {
 542                                 /* We have retried a decent amount, time to
 543                                  * fail
 544                                  */
 545                                 ret = -EBUSY;
 546                                 break;
 547                         }
 548                         fallthrough;
 549                 case -NFS4ERR_DELAY:
 550                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 551                         fallthrough;
 552                 case -NFS4ERR_GRACE:
 553                 case -NFS4ERR_LAYOUTTRYLATER:
 554                 case -NFS4ERR_RECALLCONFLICT:
 555                         exception->delay = 1;
 556                         return 0;
 557
 558                 case -NFS4ERR_RETRY_UNCACHED_REP:
 559                 case -NFS4ERR_OLD_STATEID:
 560                         exception->retry = 1;
 561                         break;
 562                 case -NFS4ERR_BADOWNER:
 563                         /* The following works around a Linux server bug! */
 564                 case -NFS4ERR_BADNAME:
 565                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 566                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 567                                 exception->retry = 1;
 568                                 printk(KERN_WARNING "NFS: v4 server %s "
 569                                                 "does not accept raw "
 570                                                 "uid/gids. "
 571                                                 "Reenabling the idmapper.\n",
 572                                                 server->nfs_client->cl_hostname);
 573                         }
 574         }
 575         /* We failed to handle the error */
 576         return nfs4_map_errors(ret);
 577 wait_on_recovery:
 578         exception->recovering = 1;
 579         return 0;
 580 }
 581
 582 /* This is the error handling routine for processes that are allowed
 583  * to sleep.
 584  */
 585 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 586 {
 587         struct nfs_client *clp = server->nfs_client;
 588         int ret;
 589
 590         ret = nfs4_do_handle_exception(server, errorcode, exception);
 591         if (exception->delay) {
 592                 ret = nfs4_delay(&exception->timeout,
 593                                 exception->interruptible);
 594                 goto out_retry;
 595         }
 596         if (exception->recovering) {
 597                 if (exception->task_is_privileged)
 598                         return -EDEADLOCK;
 599                 ret = nfs4_wait_clnt_recover(clp);
 600                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 601                         return -EIO;
 602                 goto out_retry;
 603         }
 604         return ret;
 605 out_retry:
 606         if (ret == 0)
 607                 exception->retry = 1;
 608         return ret;
 609 }
 610
 611 static int
 612 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 613                 int errorcode, struct nfs4_exception *exception)
 614 {
 615         struct nfs_client *clp = server->nfs_client;
 616         int ret;
 617
 618         ret = nfs4_do_handle_exception(server, errorcode, exception);
 619         if (exception->delay) {
 620                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 621                 goto out_retry;
 622         }
 623         if (exception->recovering) {
 624                 if (exception->task_is_privileged)
 625                         return -EDEADLOCK;
 626                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 627                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 628                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 629                 goto out_retry;
 630         }
 631         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 632                 ret = -EIO;
 633         return ret;
 634 out_retry:
 635         if (ret == 0) {
 636                 exception->retry = 1;
 637                 /*
 638                  * For NFS4ERR_MOVED, the client transport will need to
 639                  * be recomputed after migration recovery has completed.
 640                  */
 641                 if (errorcode == -NFS4ERR_MOVED)
 642                         rpc_task_release_transport(task);
 643         }
 644         return ret;
 645 }
 646
 647 int
 648 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 649                         struct nfs4_state *state, long *timeout)
 650 {
 651         struct nfs4_exception exception = {
 652                 .state = state,
 653         };
 654
 655         if (task->tk_status >= 0)
 656                 return 0;
 657         if (timeout)
 658                 exception.timeout = *timeout;
 659         task->tk_status = nfs4_async_handle_exception(task, server,
 660                         task->tk_status,
 661                         &exception);
 662         if (exception.delay && timeout)
 663                 *timeout = exception.timeout;
 664         if (exception.retry)
 665                 return -EAGAIN;
 666         return 0;
 667 }
 668
 669 /*
 670  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 671  * or 'false' otherwise.
 672  */
 673 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 674 {
 675         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 676         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 677 }
 678
 679 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 680 {
 681         spin_lock(&clp->cl_lock);
 682         if (time_before(clp->cl_last_renewal,timestamp))
 683                 clp->cl_last_renewal = timestamp;
 684         spin_unlock(&clp->cl_lock);
 685 }
 686
 687 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 688 {
 689         struct nfs_client *clp = server->nfs_client;
 690
 691         if (!nfs4_has_session(clp))
 692                 do_renew_lease(clp, timestamp);
 693 }
 694
 695 struct nfs4_call_sync_data {
 696         const struct nfs_server *seq_server;
 697         struct nfs4_sequence_args *seq_args;
 698         struct nfs4_sequence_res *seq_res;
 699 };
 700
 701 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 702                         struct nfs4_sequence_res *res, int cache_reply,
 703                         int privileged)
 704 {
 705         args->sa_slot = NULL;
 706         args->sa_cache_this = cache_reply;
 707         args->sa_privileged = privileged;
 708
 709         res->sr_slot = NULL;
 710 }
 711
 712 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 713 {
 714         struct nfs4_slot *slot = res->sr_slot;
 715         struct nfs4_slot_table *tbl;
 716
 717         tbl = slot->table;
 718         spin_lock(&tbl->slot_tbl_lock);
 719         if (!nfs41_wake_and_assign_slot(tbl, slot))
 720                 nfs4_free_slot(tbl, slot);
 721         spin_unlock(&tbl->slot_tbl_lock);
 722
 723         res->sr_slot = NULL;
 724 }
 725
 726 static int nfs40_sequence_done(struct rpc_task *task,
 727                                struct nfs4_sequence_res *res)
 728 {
 729         if (res->sr_slot != NULL)
 730                 nfs40_sequence_free_slot(res);
 731         return 1;
 732 }
 733
 734 #if defined(CONFIG_NFS_V4_1)
 735
 736 static void nfs41_release_slot(struct nfs4_slot *slot)
 737 {
 738         struct nfs4_session *session;
 739         struct nfs4_slot_table *tbl;
 740         bool send_new_highest_used_slotid = false;
 741
 742         if (!slot)
 743                 return;
 744         tbl = slot->table;
 745         session = tbl->session;
 746
 747         /* Bump the slot sequence number */
 748         if (slot->seq_done)
 749                 slot->seq_nr++;
 750         slot->seq_done = 0;
 751
 752         spin_lock(&tbl->slot_tbl_lock);
 753         /* Be nice to the server: try to ensure that the last transmitted
 754          * value for highest_user_slotid <= target_highest_slotid
 755          */
 756         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 757                 send_new_highest_used_slotid = true;
 758
 759         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 760                 send_new_highest_used_slotid = false;
 761                 goto out_unlock;
 762         }
 763         nfs4_free_slot(tbl, slot);
 764
 765         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 766                 send_new_highest_used_slotid = false;
 767 out_unlock:
 768         spin_unlock(&tbl->slot_tbl_lock);
 769         if (send_new_highest_used_slotid)
 770                 nfs41_notify_server(session->clp);
 771         if (waitqueue_active(&tbl->slot_waitq))
 772                 wake_up_all(&tbl->slot_waitq);
 773 }
 774
 775 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 776 {
 777         nfs41_release_slot(res->sr_slot);
 778         res->sr_slot = NULL;
 779 }
 780
 781 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 782                 u32 seqnr)
 783 {
 784         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 785                 slot->seq_nr_highest_sent = seqnr;
 786 }
 787 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 788 {
 789         nfs4_slot_sequence_record_sent(slot, seqnr);
 790         slot->seq_nr_last_acked = seqnr;
 791 }
 792
 793 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 794                                 struct nfs4_slot *slot)
 795 {
 796         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 797         if (!IS_ERR(task))
 798                 rpc_put_task_async(task);
 799 }
 800
 801 static int nfs41_sequence_process(struct rpc_task *task,
 802                 struct nfs4_sequence_res *res)
 803 {
 804         struct nfs4_session *session;
 805         struct nfs4_slot *slot = res->sr_slot;
 806         struct nfs_client *clp;
 807         int status;
 808         int ret = 1;
 809
 810         if (slot == NULL)
 811                 goto out_noaction;
 812         /* don't increment the sequence number if the task wasn't sent */
 813         if (!RPC_WAS_SENT(task) || slot->seq_done)
 814                 goto out;
 815
 816         session = slot->table->session;
 817         clp = session->clp;
 818
 819         trace_nfs4_sequence_done(session, res);
 820
 821         status = res->sr_status;
 822         if (task->tk_status == -NFS4ERR_DEADSESSION)
 823                 status = -NFS4ERR_DEADSESSION;
 824
 825         /* Check the SEQUENCE operation status */
 826         switch (status) {
 827         case 0:
 828                 /* Mark this sequence number as having been acked */
 829                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 830                 /* Update the slot's sequence and clientid lease timer */
 831                 slot->seq_done = 1;
 832                 do_renew_lease(clp, res->sr_timestamp);
 833                 /* Check sequence flags */
 834                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 835                                 !!slot->privileged);
 836                 nfs41_update_target_slotid(slot->table, slot, res);
 837                 break;
 838         case 1:
 839                 /*
 840                  * sr_status remains 1 if an RPC level error occurred.
 841                  * The server may or may not have processed the sequence
 842                  * operation..
 843                  */
 844                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 845                 slot->seq_done = 1;
 846                 goto out;
 847         case -NFS4ERR_DELAY:
 848                 /* The server detected a resend of the RPC call and
 849                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 850                  * of RFC5661.
 851                  */
 852                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 853                         __func__,
 854                         slot->slot_nr,
 855                         slot->seq_nr);
 856                 goto out_retry;
 857         case -NFS4ERR_RETRY_UNCACHED_REP:
 858         case -NFS4ERR_SEQ_FALSE_RETRY:
 859                 /*
 860                  * The server thinks we tried to replay a request.
 861                  * Retry the call after bumping the sequence ID.
 862                  */
 863                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 864                 goto retry_new_seq;
 865         case -NFS4ERR_BADSLOT:
 866                 /*
 867                  * The slot id we used was probably retired. Try again
 868                  * using a different slot id.
 869                  */
 870                 if (slot->slot_nr < slot->table->target_highest_slotid)
 871                         goto session_recover;
 872                 goto retry_nowait;
 873         case -NFS4ERR_SEQ_MISORDERED:
 874                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 875                 /*
 876                  * Were one or more calls using this slot interrupted?
 877                  * If the server never received the request, then our
 878                  * transmitted slot sequence number may be too high. However,
 879                  * if the server did receive the request then it might
 880                  * accidentally give us a reply with a mismatched operation.
 881                  * We can sort this out by sending a lone sequence operation
 882                  * to the server on the same slot.
 883                  */
 884                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 885                         slot->seq_nr--;
 886                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 887                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 888                                 res->sr_slot = NULL;
 889                         }
 890                         goto retry_nowait;
 891                 }
 892                 /*
 893                  * RFC5661:
 894                  * A retry might be sent while the original request is
 895                  * still in progress on the replier. The replier SHOULD
 896                  * deal with the issue by returning NFS4ERR_DELAY as the
 897                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 898                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 899                  *
 900                  * Restart the search after a delay.
 901                  */
 902                 slot->seq_nr = slot->seq_nr_highest_sent;
 903                 goto out_retry;
 904         case -NFS4ERR_BADSESSION:
 905         case -NFS4ERR_DEADSESSION:
 906         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 907                 goto session_recover;
 908         default:
 909                 /* Just update the slot sequence no. */
 910                 slot->seq_done = 1;
 911         }
 912 out:
 913         /* The session may be reset by one of the error handlers. */
 914         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 915 out_noaction:
 916         return ret;
 917 session_recover:
 918         nfs4_schedule_session_recovery(session, status);
 919         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 920         nfs41_sequence_free_slot(res);
 921         goto out;
 922 retry_new_seq:
 923         ++slot->seq_nr;
 924 retry_nowait:
 925         if (rpc_restart_call_prepare(task)) {
 926                 nfs41_sequence_free_slot(res);
 927                 task->tk_status = 0;
 928                 ret = 0;
 929         }
 930         goto out;
 931 out_retry:
 932         if (!rpc_restart_call(task))
 933                 goto out;
 934         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 935         return 0;
 936 }
 937
 938 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 939 {
 940         if (!nfs41_sequence_process(task, res))
 941                 return 0;
 942         if (res->sr_slot != NULL)
 943                 nfs41_sequence_free_slot(res);
 944         return 1;
 945
 946 }
 947 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 948
 949 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 950 {
 951         if (res->sr_slot == NULL)
 952                 return 1;
 953         if (res->sr_slot->table->session != NULL)
 954                 return nfs41_sequence_process(task, res);
 955         return nfs40_sequence_done(task, res);
 956 }
 957
 958 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 959 {
 960         if (res->sr_slot != NULL) {
 961                 if (res->sr_slot->table->session != NULL)
 962                         nfs41_sequence_free_slot(res);
 963                 else
 964                         nfs40_sequence_free_slot(res);
 965         }
 966 }
 967
 968 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 969 {
 970         if (res->sr_slot == NULL)
 971                 return 1;
 972         if (!res->sr_slot->table->session)
 973                 return nfs40_sequence_done(task, res);
 974         return nfs41_sequence_done(task, res);
 975 }
 976 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 977
 978 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 979 {
 980         struct nfs4_call_sync_data *data = calldata;
 981
 982         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 983
 984         nfs4_setup_sequence(data->seq_server->nfs_client,
 985                             data->seq_args, data->seq_res, task);
 986 }
 987
 988 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 989 {
 990         struct nfs4_call_sync_data *data = calldata;
 991
 992         nfs41_sequence_done(task, data->seq_res);
 993 }
 994
 995 static const struct rpc_call_ops nfs41_call_sync_ops = {
 996         .rpc_call_prepare = nfs41_call_sync_prepare,
 997         .rpc_call_done = nfs41_call_sync_done,
 998 };
 999
1000 #else   /* !CONFIG_NFS_V4_1 */
1001
1002 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1003 {
1004         return nfs40_sequence_done(task, res);
1005 }
1006
1007 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1008 {
1009         if (res->sr_slot != NULL)
1010                 nfs40_sequence_free_slot(res);
1011 }
1012
1013 int nfs4_sequence_done(struct rpc_task *task,
1014                        struct nfs4_sequence_res *res)
1015 {
1016         return nfs40_sequence_done(task, res);
1017 }
1018 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1019
1020 #endif  /* !CONFIG_NFS_V4_1 */
1021
1022 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1023 {
1024         res->sr_timestamp = jiffies;
1025         res->sr_status_flags = 0;
1026         res->sr_status = 1;
1027 }
1028
1029 static
1030 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1031                 struct nfs4_sequence_res *res,
1032                 struct nfs4_slot *slot)
1033 {
1034         if (!slot)
1035                 return;
1036         slot->privileged = args->sa_privileged ? 1 : 0;
1037         args->sa_slot = slot;
1038
1039         res->sr_slot = slot;
1040 }
1041
1042 int nfs4_setup_sequence(struct nfs_client *client,
1043                         struct nfs4_sequence_args *args,
1044                         struct nfs4_sequence_res *res,
1045                         struct rpc_task *task)
1046 {
1047         struct nfs4_session *session = nfs4_get_session(client);
1048         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1049         struct nfs4_slot *slot;
1050
1051         /* slot already allocated? */
1052         if (res->sr_slot != NULL)
1053                 goto out_start;
1054
1055         if (session)
1056                 tbl = &session->fc_slot_table;
1057
1058         spin_lock(&tbl->slot_tbl_lock);
1059         /* The state manager will wait until the slot table is empty */
1060         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1061                 goto out_sleep;
1062
1063         slot = nfs4_alloc_slot(tbl);
1064         if (IS_ERR(slot)) {
1065                 if (slot == ERR_PTR(-ENOMEM))
1066                         goto out_sleep_timeout;
1067                 goto out_sleep;
1068         }
1069         spin_unlock(&tbl->slot_tbl_lock);
1070
1071         nfs4_sequence_attach_slot(args, res, slot);
1072
1073         trace_nfs4_setup_sequence(session, args);
1074 out_start:
1075         nfs41_sequence_res_init(res);
1076         rpc_call_start(task);
1077         return 0;
1078 out_sleep_timeout:
1079         /* Try again in 1/4 second */
1080         if (args->sa_privileged)
1081                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1082                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1083         else
1084                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1085                                 NULL, jiffies + (HZ >> 2));
1086         spin_unlock(&tbl->slot_tbl_lock);
1087         return -EAGAIN;
1088 out_sleep:
1089         if (args->sa_privileged)
1090                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1091                                 RPC_PRIORITY_PRIVILEGED);
1092         else
1093                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1094         spin_unlock(&tbl->slot_tbl_lock);
1095         return -EAGAIN;
1096 }
1097 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1098
1099 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1100 {
1101         struct nfs4_call_sync_data *data = calldata;
1102         nfs4_setup_sequence(data->seq_server->nfs_client,
1103                                 data->seq_args, data->seq_res, task);
1104 }
1105
1106 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1107 {
1108         struct nfs4_call_sync_data *data = calldata;
1109         nfs4_sequence_done(task, data->seq_res);
1110 }
1111
1112 static const struct rpc_call_ops nfs40_call_sync_ops = {
1113         .rpc_call_prepare = nfs40_call_sync_prepare,
1114         .rpc_call_done = nfs40_call_sync_done,
1115 };
1116
1117 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1118 {
1119         int ret;
1120         struct rpc_task *task;
1121
1122         task = rpc_run_task(task_setup);
1123         if (IS_ERR(task))
1124                 return PTR_ERR(task);
1125
1126         ret = task->tk_status;
1127         rpc_put_task(task);
1128         return ret;
1129 }
1130
1131 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1132                              struct nfs_server *server,
1133                              struct rpc_message *msg,
1134                              struct nfs4_sequence_args *args,
1135                              struct nfs4_sequence_res *res,
1136                              unsigned short task_flags)
1137 {
1138         struct nfs_client *clp = server->nfs_client;
1139         struct nfs4_call_sync_data data = {
1140                 .seq_server = server,
1141                 .seq_args = args,
1142                 .seq_res = res,
1143         };
1144         struct rpc_task_setup task_setup = {
1145                 .rpc_client = clnt,
1146                 .rpc_message = msg,
1147                 .callback_ops = clp->cl_mvops->call_sync_ops,
1148                 .callback_data = &data,
1149                 .flags = task_flags,
1150         };
1151
1152         return nfs4_call_sync_custom(&task_setup);
1153 }
1154
1155 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1156                                    struct nfs_server *server,
1157                                    struct rpc_message *msg,
1158                                    struct nfs4_sequence_args *args,
1159                                    struct nfs4_sequence_res *res)
1160 {
1161         unsigned short task_flags = 0;
1162
1163         if (server->caps & NFS_CAP_MOVEABLE)
1164                 task_flags = RPC_TASK_MOVEABLE;
1165         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1166 }
1167
1168
1169 int nfs4_call_sync(struct rpc_clnt *clnt,
1170                    struct nfs_server *server,
1171                    struct rpc_message *msg,
1172                    struct nfs4_sequence_args *args,
1173                    struct nfs4_sequence_res *res,
1174                    int cache_reply)
1175 {
1176         nfs4_init_sequence(args, res, cache_reply, 0);
1177         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1178 }
1179
1180 static void
1181 nfs4_inc_nlink_locked(struct inode *inode)
1182 {
1183         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1184                                              NFS_INO_INVALID_CTIME |
1185                                              NFS_INO_INVALID_NLINK);
1186         inc_nlink(inode);
1187 }
1188
1189 static void
1190 nfs4_inc_nlink(struct inode *inode)
1191 {
1192         spin_lock(&inode->i_lock);
1193         nfs4_inc_nlink_locked(inode);
1194         spin_unlock(&inode->i_lock);
1195 }
1196
1197 static void
1198 nfs4_dec_nlink_locked(struct inode *inode)
1199 {
1200         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1201                                              NFS_INO_INVALID_CTIME |
1202                                              NFS_INO_INVALID_NLINK);
1203         drop_nlink(inode);
1204 }
1205
1206 static void
1207 nfs4_update_changeattr_locked(struct inode *inode,
1208                 struct nfs4_change_info *cinfo,
1209                 unsigned long timestamp, unsigned long cache_validity)
1210 {
1211         struct nfs_inode *nfsi = NFS_I(inode);
1212         u64 change_attr = inode_peek_iversion_raw(inode);
1213
1214         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1215         if (S_ISDIR(inode->i_mode))
1216                 cache_validity |= NFS_INO_INVALID_DATA;
1217
1218         switch (NFS_SERVER(inode)->change_attr_type) {
1219         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1220                 if (cinfo->after == change_attr)
1221                         goto out;
1222                 break;
1223         default:
1224                 if ((s64)(change_attr - cinfo->after) >= 0)
1225                         goto out;
1226         }
1227
1228         inode_set_iversion_raw(inode, cinfo->after);
1229         if (!cinfo->atomic || cinfo->before != change_attr) {
1230                 if (S_ISDIR(inode->i_mode))
1231                         nfs_force_lookup_revalidate(inode);
1232
1233                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1234                         cache_validity |=
1235                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1236                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1237                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1238                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1239                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1240         }
1241         nfsi->attrtimeo_timestamp = jiffies;
1242         nfsi->read_cache_jiffies = timestamp;
1243         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1244         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1245 out:
1246         nfs_set_cache_invalid(inode, cache_validity);
1247 }
1248
1249 void
1250 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1251                 unsigned long timestamp, unsigned long cache_validity)
1252 {
1253         spin_lock(&dir->i_lock);
1254         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1255         spin_unlock(&dir->i_lock);
1256 }
1257
1258 struct nfs4_open_createattrs {
1259         struct nfs4_label *label;
1260         struct iattr *sattr;
1261         const __u32 verf[2];
1262 };
1263
1264 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1265                 int err, struct nfs4_exception *exception)
1266 {
1267         if (err != -EINVAL)
1268                 return false;
1269         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1270                 return false;
1271         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1272         exception->retry = 1;
1273         return true;
1274 }
1275
1276 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1277 {
1278          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1279 }
1280
1281 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1282 {
1283         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1284
1285         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1286 }
1287
1288 static u32
1289 nfs4_map_atomic_open_share(struct nfs_server *server,
1290                 fmode_t fmode, int openflags)
1291 {
1292         u32 res = 0;
1293
1294         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1295         case FMODE_READ:
1296                 res = NFS4_SHARE_ACCESS_READ;
1297                 break;
1298         case FMODE_WRITE:
1299                 res = NFS4_SHARE_ACCESS_WRITE;
1300                 break;
1301         case FMODE_READ|FMODE_WRITE:
1302                 res = NFS4_SHARE_ACCESS_BOTH;
1303         }
1304         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1305                 goto out;
1306         /* Want no delegation if we're using O_DIRECT */
1307         if (openflags & O_DIRECT)
1308                 res |= NFS4_SHARE_WANT_NO_DELEG;
1309 out:
1310         return res;
1311 }
1312
1313 static enum open_claim_type4
1314 nfs4_map_atomic_open_claim(struct nfs_server *server,
1315                 enum open_claim_type4 claim)
1316 {
1317         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1318                 return claim;
1319         switch (claim) {
1320         default:
1321                 return claim;
1322         case NFS4_OPEN_CLAIM_FH:
1323                 return NFS4_OPEN_CLAIM_NULL;
1324         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1325                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1326         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1327                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1328         }
1329 }
1330
1331 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1332 {
1333         p->o_res.f_attr = &p->f_attr;
1334         p->o_res.seqid = p->o_arg.seqid;
1335         p->c_res.seqid = p->c_arg.seqid;
1336         p->o_res.server = p->o_arg.server;
1337         p->o_res.access_request = p->o_arg.access;
1338         nfs_fattr_init(&p->f_attr);
1339         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1340 }
1341
1342 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1343                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1344                 const struct nfs4_open_createattrs *c,
1345                 enum open_claim_type4 claim,
1346                 gfp_t gfp_mask)
1347 {
1348         struct dentry *parent = dget_parent(dentry);
1349         struct inode *dir = d_inode(parent);
1350         struct nfs_server *server = NFS_SERVER(dir);
1351         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1352         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1353         struct nfs4_opendata *p;
1354
1355         p = kzalloc(sizeof(*p), gfp_mask);
1356         if (p == NULL)
1357                 goto err;
1358
1359         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1360         if (IS_ERR(p->f_attr.label))
1361                 goto err_free_p;
1362
1363         p->a_label = nfs4_label_alloc(server, gfp_mask);
1364         if (IS_ERR(p->a_label))
1365                 goto err_free_f;
1366
1367         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1368         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1369         if (IS_ERR(p->o_arg.seqid))
1370                 goto err_free_label;
1371         nfs_sb_active(dentry->d_sb);
1372         p->dentry = dget(dentry);
1373         p->dir = parent;
1374         p->owner = sp;
1375         atomic_inc(&sp->so_count);
1376         p->o_arg.open_flags = flags;
1377         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1378         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1379         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1380                         fmode, flags);
1381         if (flags & O_CREAT) {
1382                 p->o_arg.umask = current_umask();
1383                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1384                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1385                         p->o_arg.u.attrs = &p->attrs;
1386                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1387
1388                         memcpy(p->o_arg.u.verifier.data, c->verf,
1389                                         sizeof(p->o_arg.u.verifier.data));
1390                 }
1391         }
1392         /* ask server to check for all possible rights as results
1393          * are cached */
1394         switch (p->o_arg.claim) {
1395         default:
1396                 break;
1397         case NFS4_OPEN_CLAIM_NULL:
1398         case NFS4_OPEN_CLAIM_FH:
1399                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1400                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1401                                   NFS4_ACCESS_EXECUTE |
1402                                   nfs_access_xattr_mask(server);
1403         }
1404         p->o_arg.clientid = server->nfs_client->cl_clientid;
1405         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1406         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1407         p->o_arg.name = &dentry->d_name;
1408         p->o_arg.server = server;
1409         p->o_arg.bitmask = nfs4_bitmask(server, label);
1410         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1411         switch (p->o_arg.claim) {
1412         case NFS4_OPEN_CLAIM_NULL:
1413         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1414         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1415                 p->o_arg.fh = NFS_FH(dir);
1416                 break;
1417         case NFS4_OPEN_CLAIM_PREVIOUS:
1418         case NFS4_OPEN_CLAIM_FH:
1419         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1420         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1421                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1422         }
1423         p->c_arg.fh = &p->o_res.fh;
1424         p->c_arg.stateid = &p->o_res.stateid;
1425         p->c_arg.seqid = p->o_arg.seqid;
1426         nfs4_init_opendata_res(p);
1427         kref_init(&p->kref);
1428         return p;
1429
1430 err_free_label:
1431         nfs4_label_free(p->a_label);
1432 err_free_f:
1433         nfs4_label_free(p->f_attr.label);
1434 err_free_p:
1435         kfree(p);
1436 err:
1437         dput(parent);
1438         return NULL;
1439 }
1440
1441 static void nfs4_opendata_free(struct kref *kref)
1442 {
1443         struct nfs4_opendata *p = container_of(kref,
1444                         struct nfs4_opendata, kref);
1445         struct super_block *sb = p->dentry->d_sb;
1446
1447         nfs4_lgopen_release(p->lgp);
1448         nfs_free_seqid(p->o_arg.seqid);
1449         nfs4_sequence_free_slot(&p->o_res.seq_res);
1450         if (p->state != NULL)
1451                 nfs4_put_open_state(p->state);
1452         nfs4_put_state_owner(p->owner);
1453
1454         nfs4_label_free(p->a_label);
1455         nfs4_label_free(p->f_attr.label);
1456
1457         dput(p->dir);
1458         dput(p->dentry);
1459         nfs_sb_deactive(sb);
1460         nfs_fattr_free_names(&p->f_attr);
1461         kfree(p->f_attr.mdsthreshold);
1462         kfree(p);
1463 }
1464
1465 static void nfs4_opendata_put(struct nfs4_opendata *p)
1466 {
1467         if (p != NULL)
1468                 kref_put(&p->kref, nfs4_opendata_free);
1469 }
1470
1471 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1472                 fmode_t fmode)
1473 {
1474         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1475         case FMODE_READ|FMODE_WRITE:
1476                 return state->n_rdwr != 0;
1477         case FMODE_WRITE:
1478                 return state->n_wronly != 0;
1479         case FMODE_READ:
1480                 return state->n_rdonly != 0;
1481         }
1482         WARN_ON_ONCE(1);
1483         return false;
1484 }
1485
1486 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1487                 int open_mode, enum open_claim_type4 claim)
1488 {
1489         int ret = 0;
1490
1491         if (open_mode & (O_EXCL|O_TRUNC))
1492                 goto out;
1493         switch (claim) {
1494         case NFS4_OPEN_CLAIM_NULL:
1495         case NFS4_OPEN_CLAIM_FH:
1496                 goto out;
1497         default:
1498                 break;
1499         }
1500         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1501                 case FMODE_READ:
1502                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1503                                 && state->n_rdonly != 0;
1504                         break;
1505                 case FMODE_WRITE:
1506                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1507                                 && state->n_wronly != 0;
1508                         break;
1509                 case FMODE_READ|FMODE_WRITE:
1510                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1511                                 && state->n_rdwr != 0;
1512         }
1513 out:
1514         return ret;
1515 }
1516
1517 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1518                 enum open_claim_type4 claim)
1519 {
1520         if (delegation == NULL)
1521                 return 0;
1522         if ((delegation->type & fmode) != fmode)
1523                 return 0;
1524         switch (claim) {
1525         case NFS4_OPEN_CLAIM_NULL:
1526         case NFS4_OPEN_CLAIM_FH:
1527                 break;
1528         case NFS4_OPEN_CLAIM_PREVIOUS:
1529                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1530                         break;
1531                 fallthrough;
1532         default:
1533                 return 0;
1534         }
1535         nfs_mark_delegation_referenced(delegation);
1536         return 1;
1537 }
1538
1539 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1540 {
1541         switch (fmode) {
1542                 case FMODE_WRITE:
1543                         state->n_wronly++;
1544                         break;
1545                 case FMODE_READ:
1546                         state->n_rdonly++;
1547                         break;
1548                 case FMODE_READ|FMODE_WRITE:
1549                         state->n_rdwr++;
1550         }
1551         nfs4_state_set_mode_locked(state, state->state | fmode);
1552 }
1553
1554 #ifdef CONFIG_NFS_V4_1
1555 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1556 {
1557         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1558                 return true;
1559         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1560                 return true;
1561         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1562                 return true;
1563         return false;
1564 }
1565 #endif /* CONFIG_NFS_V4_1 */
1566
1567 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1568 {
1569         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1570                 wake_up_all(&state->waitq);
1571 }
1572
1573 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1574 {
1575         struct nfs_client *clp = state->owner->so_server->nfs_client;
1576         bool need_recover = false;
1577
1578         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1579                 need_recover = true;
1580         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1581                 need_recover = true;
1582         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1583                 need_recover = true;
1584         if (need_recover)
1585                 nfs4_state_mark_reclaim_nograce(clp, state);
1586 }
1587
1588 /*
1589  * Check for whether or not the caller may update the open stateid
1590  * to the value passed in by stateid.
1591  *
1592  * Note: This function relies heavily on the server implementing
1593  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1594  * correctly.
1595  * i.e. The stateid seqids have to be initialised to 1, and
1596  * are then incremented on every state transition.
1597  */
1598 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1599                 const nfs4_stateid *stateid)
1600 {
1601         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1602                 /* The common case - we're updating to a new sequence number */
1603                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1604                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1605                                 return true;
1606                         return false;
1607                 }
1608                 /* The server returned a new stateid */
1609         }
1610         /* This is the first OPEN in this generation */
1611         if (stateid->seqid == cpu_to_be32(1))
1612                 return true;
1613         return false;
1614 }
1615
1616 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1617 {
1618         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1619                 return;
1620         if (state->n_wronly)
1621                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1622         if (state->n_rdonly)
1623                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1624         if (state->n_rdwr)
1625                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1626         set_bit(NFS_OPEN_STATE, &state->flags);
1627 }
1628
1629 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1630                 nfs4_stateid *stateid, fmode_t fmode)
1631 {
1632         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1633         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1634         case FMODE_WRITE:
1635                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1636                 break;
1637         case FMODE_READ:
1638                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1639                 break;
1640         case 0:
1641                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1642                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1643                 clear_bit(NFS_OPEN_STATE, &state->flags);
1644         }
1645         if (stateid == NULL)
1646                 return;
1647         /* Handle OPEN+OPEN_DOWNGRADE races */
1648         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1649             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1650                 nfs_resync_open_stateid_locked(state);
1651                 goto out;
1652         }
1653         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1654                 nfs4_stateid_copy(&state->stateid, stateid);
1655         nfs4_stateid_copy(&state->open_stateid, stateid);
1656         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1657 out:
1658         nfs_state_log_update_open_stateid(state);
1659 }
1660
1661 static void nfs_clear_open_stateid(struct nfs4_state *state,
1662         nfs4_stateid *arg_stateid,
1663         nfs4_stateid *stateid, fmode_t fmode)
1664 {
1665         write_seqlock(&state->seqlock);
1666         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1667         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1668                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1669         write_sequnlock(&state->seqlock);
1670         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1671                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1672 }
1673
1674 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1675                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1676         __must_hold(&state->owner->so_lock)
1677         __must_hold(&state->seqlock)
1678         __must_hold(RCU)
1679
1680 {
1681         DEFINE_WAIT(wait);
1682         int status = 0;
1683         for (;;) {
1684
1685                 if (nfs_stateid_is_sequential(state, stateid))
1686                         break;
1687
1688                 if (status)
1689                         break;
1690                 /* Rely on seqids for serialisation with NFSv4.0 */
1691                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1692                         break;
1693
1694                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1695                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1696                 /*
1697                  * Ensure we process the state changes in the same order
1698                  * in which the server processed them by delaying the
1699                  * update of the stateid until we are in sequence.
1700                  */
1701                 write_sequnlock(&state->seqlock);
1702                 spin_unlock(&state->owner->so_lock);
1703                 rcu_read_unlock();
1704                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1705
1706                 if (!fatal_signal_pending(current)) {
1707                         if (schedule_timeout(5*HZ) == 0)
1708                                 status = -EAGAIN;
1709                         else
1710                                 status = 0;
1711                 } else
1712                         status = -EINTR;
1713                 finish_wait(&state->waitq, &wait);
1714                 rcu_read_lock();
1715                 spin_lock(&state->owner->so_lock);
1716                 write_seqlock(&state->seqlock);
1717         }
1718
1719         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1720             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1721                 nfs4_stateid_copy(freeme, &state->open_stateid);
1722                 nfs_test_and_clear_all_open_stateid(state);
1723         }
1724
1725         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1726                 nfs4_stateid_copy(&state->stateid, stateid);
1727         nfs4_stateid_copy(&state->open_stateid, stateid);
1728         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1729         nfs_state_log_update_open_stateid(state);
1730 }
1731
1732 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1733                 const nfs4_stateid *open_stateid,
1734                 fmode_t fmode,
1735                 nfs4_stateid *freeme)
1736 {
1737         /*
1738          * Protect the call to nfs4_state_set_mode_locked and
1739          * serialise the stateid update
1740          */
1741         write_seqlock(&state->seqlock);
1742         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1743         switch (fmode) {
1744         case FMODE_READ:
1745                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1746                 break;
1747         case FMODE_WRITE:
1748                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1749                 break;
1750         case FMODE_READ|FMODE_WRITE:
1751                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1752         }
1753         set_bit(NFS_OPEN_STATE, &state->flags);
1754         write_sequnlock(&state->seqlock);
1755 }
1756
1757 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1758 {
1759         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1760         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1761         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1762         clear_bit(NFS_OPEN_STATE, &state->flags);
1763 }
1764
1765 static void nfs_state_set_delegation(struct nfs4_state *state,
1766                 const nfs4_stateid *deleg_stateid,
1767                 fmode_t fmode)
1768 {
1769         /*
1770          * Protect the call to nfs4_state_set_mode_locked and
1771          * serialise the stateid update
1772          */
1773         write_seqlock(&state->seqlock);
1774         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1775         set_bit(NFS_DELEGATED_STATE, &state->flags);
1776         write_sequnlock(&state->seqlock);
1777 }
1778
1779 static void nfs_state_clear_delegation(struct nfs4_state *state)
1780 {
1781         write_seqlock(&state->seqlock);
1782         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1783         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1784         write_sequnlock(&state->seqlock);
1785 }
1786
1787 int update_open_stateid(struct nfs4_state *state,
1788                 const nfs4_stateid *open_stateid,
1789                 const nfs4_stateid *delegation,
1790                 fmode_t fmode)
1791 {
1792         struct nfs_server *server = NFS_SERVER(state->inode);
1793         struct nfs_client *clp = server->nfs_client;
1794         struct nfs_inode *nfsi = NFS_I(state->inode);
1795         struct nfs_delegation *deleg_cur;
1796         nfs4_stateid freeme = { };
1797         int ret = 0;
1798
1799         fmode &= (FMODE_READ|FMODE_WRITE);
1800
1801         rcu_read_lock();
1802         spin_lock(&state->owner->so_lock);
1803         if (open_stateid != NULL) {
1804                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1805                 ret = 1;
1806         }
1807
1808         deleg_cur = nfs4_get_valid_delegation(state->inode);
1809         if (deleg_cur == NULL)
1810                 goto no_delegation;
1811
1812         spin_lock(&deleg_cur->lock);
1813         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1814            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1815             (deleg_cur->type & fmode) != fmode)
1816                 goto no_delegation_unlock;
1817
1818         if (delegation == NULL)
1819                 delegation = &deleg_cur->stateid;
1820         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1821                 goto no_delegation_unlock;
1822
1823         nfs_mark_delegation_referenced(deleg_cur);
1824         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1825         ret = 1;
1826 no_delegation_unlock:
1827         spin_unlock(&deleg_cur->lock);
1828 no_delegation:
1829         if (ret)
1830                 update_open_stateflags(state, fmode);
1831         spin_unlock(&state->owner->so_lock);
1832         rcu_read_unlock();
1833
1834         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1835                 nfs4_schedule_state_manager(clp);
1836         if (freeme.type != 0)
1837                 nfs4_test_and_free_stateid(server, &freeme,
1838                                 state->owner->so_cred);
1839
1840         return ret;
1841 }
1842
1843 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1844                 const nfs4_stateid *stateid)
1845 {
1846         struct nfs4_state *state = lsp->ls_state;
1847         bool ret = false;
1848
1849         spin_lock(&state->state_lock);
1850         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1851                 goto out_noupdate;
1852         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1853                 goto out_noupdate;
1854         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1855         ret = true;
1856 out_noupdate:
1857         spin_unlock(&state->state_lock);
1858         return ret;
1859 }
1860
1861 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1862 {
1863         struct nfs_delegation *delegation;
1864
1865         fmode &= FMODE_READ|FMODE_WRITE;
1866         rcu_read_lock();
1867         delegation = nfs4_get_valid_delegation(inode);
1868         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1869                 rcu_read_unlock();
1870                 return;
1871         }
1872         rcu_read_unlock();
1873         nfs4_inode_return_delegation(inode);
1874 }
1875
1876 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1877 {
1878         struct nfs4_state *state = opendata->state;
1879         struct nfs_delegation *delegation;
1880         int open_mode = opendata->o_arg.open_flags;
1881         fmode_t fmode = opendata->o_arg.fmode;
1882         enum open_claim_type4 claim = opendata->o_arg.claim;
1883         nfs4_stateid stateid;
1884         int ret = -EAGAIN;
1885
1886         for (;;) {
1887                 spin_lock(&state->owner->so_lock);
1888                 if (can_open_cached(state, fmode, open_mode, claim)) {
1889                         update_open_stateflags(state, fmode);
1890                         spin_unlock(&state->owner->so_lock);
1891                         goto out_return_state;
1892                 }
1893                 spin_unlock(&state->owner->so_lock);
1894                 rcu_read_lock();
1895                 delegation = nfs4_get_valid_delegation(state->inode);
1896                 if (!can_open_delegated(delegation, fmode, claim)) {
1897                         rcu_read_unlock();
1898                         break;
1899                 }
1900                 /* Save the delegation */
1901                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1902                 rcu_read_unlock();
1903                 nfs_release_seqid(opendata->o_arg.seqid);
1904                 if (!opendata->is_recover) {
1905                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1906                         if (ret != 0)
1907                                 goto out;
1908                 }
1909                 ret = -EAGAIN;
1910
1911                 /* Try to update the stateid using the delegation */
1912                 if (update_open_stateid(state, NULL, &stateid, fmode))
1913                         goto out_return_state;
1914         }
1915 out:
1916         return ERR_PTR(ret);
1917 out_return_state:
1918         refcount_inc(&state->count);
1919         return state;
1920 }
1921
1922 static void
1923 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1924 {
1925         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1926         struct nfs_delegation *delegation;
1927         int delegation_flags = 0;
1928
1929         rcu_read_lock();
1930         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1931         if (delegation)
1932                 delegation_flags = delegation->flags;
1933         rcu_read_unlock();
1934         switch (data->o_arg.claim) {
1935         default:
1936                 break;
1937         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1938         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1939                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1940                                    "returning a delegation for "
1941                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1942                                    clp->cl_hostname);
1943                 return;
1944         }
1945         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1946                 nfs_inode_set_delegation(state->inode,
1947                                 data->owner->so_cred,
1948                                 data->o_res.delegation_type,
1949                                 &data->o_res.delegation,
1950                                 data->o_res.pagemod_limit);
1951         else
1952                 nfs_inode_reclaim_delegation(state->inode,
1953                                 data->owner->so_cred,
1954                                 data->o_res.delegation_type,
1955                                 &data->o_res.delegation,
1956                                 data->o_res.pagemod_limit);
1957
1958         if (data->o_res.do_recall)
1959                 nfs_async_inode_return_delegation(state->inode,
1960                                                   &data->o_res.delegation);
1961 }
1962
1963 /*
1964  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1965  * and update the nfs4_state.
1966  */
1967 static struct nfs4_state *
1968 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1969 {
1970         struct inode *inode = data->state->inode;
1971         struct nfs4_state *state = data->state;
1972         int ret;
1973
1974         if (!data->rpc_done) {
1975                 if (data->rpc_status)
1976                         return ERR_PTR(data->rpc_status);
1977                 /* cached opens have already been processed */
1978                 goto update;
1979         }
1980
1981         ret = nfs_refresh_inode(inode, &data->f_attr);
1982         if (ret)
1983                 return ERR_PTR(ret);
1984
1985         if (data->o_res.delegation_type != 0)
1986                 nfs4_opendata_check_deleg(data, state);
1987 update:
1988         if (!update_open_stateid(state, &data->o_res.stateid,
1989                                 NULL, data->o_arg.fmode))
1990                 return ERR_PTR(-EAGAIN);
1991         refcount_inc(&state->count);
1992
1993         return state;
1994 }
1995
1996 static struct inode *
1997 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1998 {
1999         struct inode *inode;
2000
2001         switch (data->o_arg.claim) {
2002         case NFS4_OPEN_CLAIM_NULL:
2003         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2004         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2005                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2006                         return ERR_PTR(-EAGAIN);
2007                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2008                                 &data->f_attr);
2009                 break;
2010         default:
2011                 inode = d_inode(data->dentry);
2012                 ihold(inode);
2013                 nfs_refresh_inode(inode, &data->f_attr);
2014         }
2015         return inode;
2016 }
2017
2018 static struct nfs4_state *
2019 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2020 {
2021         struct nfs4_state *state;
2022         struct inode *inode;
2023
2024         inode = nfs4_opendata_get_inode(data);
2025         if (IS_ERR(inode))
2026                 return ERR_CAST(inode);
2027         if (data->state != NULL && data->state->inode == inode) {
2028                 state = data->state;
2029                 refcount_inc(&state->count);
2030         } else
2031                 state = nfs4_get_open_state(inode, data->owner);
2032         iput(inode);
2033         if (state == NULL)
2034                 state = ERR_PTR(-ENOMEM);
2035         return state;
2036 }
2037
2038 static struct nfs4_state *
2039 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2040 {
2041         struct nfs4_state *state;
2042
2043         if (!data->rpc_done) {
2044                 state = nfs4_try_open_cached(data);
2045                 trace_nfs4_cached_open(data->state);
2046                 goto out;
2047         }
2048
2049         state = nfs4_opendata_find_nfs4_state(data);
2050         if (IS_ERR(state))
2051                 goto out;
2052
2053         if (data->o_res.delegation_type != 0)
2054                 nfs4_opendata_check_deleg(data, state);
2055         if (!update_open_stateid(state, &data->o_res.stateid,
2056                                 NULL, data->o_arg.fmode)) {
2057                 nfs4_put_open_state(state);
2058                 state = ERR_PTR(-EAGAIN);
2059         }
2060 out:
2061         nfs_release_seqid(data->o_arg.seqid);
2062         return state;
2063 }
2064
2065 static struct nfs4_state *
2066 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2067 {
2068         struct nfs4_state *ret;
2069
2070         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2071                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2072         else
2073                 ret = _nfs4_opendata_to_nfs4_state(data);
2074         nfs4_sequence_free_slot(&data->o_res.seq_res);
2075         return ret;
2076 }
2077
2078 static struct nfs_open_context *
2079 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2080 {
2081         struct nfs_inode *nfsi = NFS_I(state->inode);
2082         struct nfs_open_context *ctx;
2083
2084         rcu_read_lock();
2085         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2086                 if (ctx->state != state)
2087                         continue;
2088                 if ((ctx->mode & mode) != mode)
2089                         continue;
2090                 if (!get_nfs_open_context(ctx))
2091                         continue;
2092                 rcu_read_unlock();
2093                 return ctx;
2094         }
2095         rcu_read_unlock();
2096         return ERR_PTR(-ENOENT);
2097 }
2098
2099 static struct nfs_open_context *
2100 nfs4_state_find_open_context(struct nfs4_state *state)
2101 {
2102         struct nfs_open_context *ctx;
2103
2104         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2105         if (!IS_ERR(ctx))
2106                 return ctx;
2107         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2108         if (!IS_ERR(ctx))
2109                 return ctx;
2110         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2111 }
2112
2113 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2114                 struct nfs4_state *state, enum open_claim_type4 claim)
2115 {
2116         struct nfs4_opendata *opendata;
2117
2118         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2119                         NULL, claim, GFP_NOFS);
2120         if (opendata == NULL)
2121                 return ERR_PTR(-ENOMEM);
2122         opendata->state = state;
2123         refcount_inc(&state->count);
2124         return opendata;
2125 }
2126
2127 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2128                 fmode_t fmode)
2129 {
2130         struct nfs4_state *newstate;
2131         int ret;
2132
2133         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2134                 return 0;
2135         opendata->o_arg.open_flags = 0;
2136         opendata->o_arg.fmode = fmode;
2137         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2138                         NFS_SB(opendata->dentry->d_sb),
2139                         fmode, 0);
2140         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2141         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2142         nfs4_init_opendata_res(opendata);
2143         ret = _nfs4_recover_proc_open(opendata);
2144         if (ret != 0)
2145                 return ret;
2146         newstate = nfs4_opendata_to_nfs4_state(opendata);
2147         if (IS_ERR(newstate))
2148                 return PTR_ERR(newstate);
2149         if (newstate != opendata->state)
2150                 ret = -ESTALE;
2151         nfs4_close_state(newstate, fmode);
2152         return ret;
2153 }
2154
2155 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2156 {
2157         int ret;
2158
2159         /* memory barrier prior to reading state->n_* */
2160         smp_rmb();
2161         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2162         if (ret != 0)
2163                 return ret;
2164         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2165         if (ret != 0)
2166                 return ret;
2167         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2168         if (ret != 0)
2169                 return ret;
2170         /*
2171          * We may have performed cached opens for all three recoveries.
2172          * Check if we need to update the current stateid.
2173          */
2174         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2175             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2176                 write_seqlock(&state->seqlock);
2177                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2178                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2179                 write_sequnlock(&state->seqlock);
2180         }
2181         return 0;
2182 }
2183
2184 /*
2185  * OPEN_RECLAIM:
2186  *      reclaim state on the server after a reboot.
2187  */
2188 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2189 {
2190         struct nfs_delegation *delegation;
2191         struct nfs4_opendata *opendata;
2192         fmode_t delegation_type = 0;
2193         int status;
2194
2195         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2196                         NFS4_OPEN_CLAIM_PREVIOUS);
2197         if (IS_ERR(opendata))
2198                 return PTR_ERR(opendata);
2199         rcu_read_lock();
2200         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2201         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2202                 delegation_type = delegation->type;
2203         rcu_read_unlock();
2204         opendata->o_arg.u.delegation_type = delegation_type;
2205         status = nfs4_open_recover(opendata, state);
2206         nfs4_opendata_put(opendata);
2207         return status;
2208 }
2209
2210 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2211 {
2212         struct nfs_server *server = NFS_SERVER(state->inode);
2213         struct nfs4_exception exception = { };
2214         int err;
2215         do {
2216                 err = _nfs4_do_open_reclaim(ctx, state);
2217                 trace_nfs4_open_reclaim(ctx, 0, err);
2218                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2219                         continue;
2220                 if (err != -NFS4ERR_DELAY)
2221                         break;
2222                 nfs4_handle_exception(server, err, &exception);
2223         } while (exception.retry);
2224         return err;
2225 }
2226
2227 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2228 {
2229         struct nfs_open_context *ctx;
2230         int ret;
2231
2232         ctx = nfs4_state_find_open_context(state);
2233         if (IS_ERR(ctx))
2234                 return -EAGAIN;
2235         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2236         nfs_state_clear_open_state_flags(state);
2237         ret = nfs4_do_open_reclaim(ctx, state);
2238         put_nfs_open_context(ctx);
2239         return ret;
2240 }
2241
2242 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2243 {
2244         switch (err) {
2245                 default:
2246                         printk(KERN_ERR "NFS: %s: unhandled error "
2247                                         "%d.\n", __func__, err);
2248                         fallthrough;
2249                 case 0:
2250                 case -ENOENT:
2251                 case -EAGAIN:
2252                 case -ESTALE:
2253                 case -ETIMEDOUT:
2254                         break;
2255                 case -NFS4ERR_BADSESSION:
2256                 case -NFS4ERR_BADSLOT:
2257                 case -NFS4ERR_BAD_HIGH_SLOT:
2258                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2259                 case -NFS4ERR_DEADSESSION:
2260                         return -EAGAIN;
2261                 case -NFS4ERR_STALE_CLIENTID:
2262                 case -NFS4ERR_STALE_STATEID:
2263                         /* Don't recall a delegation if it was lost */
2264                         nfs4_schedule_lease_recovery(server->nfs_client);
2265                         return -EAGAIN;
2266                 case -NFS4ERR_MOVED:
2267                         nfs4_schedule_migration_recovery(server);
2268                         return -EAGAIN;
2269                 case -NFS4ERR_LEASE_MOVED:
2270                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2271                         return -EAGAIN;
2272                 case -NFS4ERR_DELEG_REVOKED:
2273                 case -NFS4ERR_ADMIN_REVOKED:
2274                 case -NFS4ERR_EXPIRED:
2275                 case -NFS4ERR_BAD_STATEID:
2276                 case -NFS4ERR_OPENMODE:
2277                         nfs_inode_find_state_and_recover(state->inode,
2278                                         stateid);
2279                         nfs4_schedule_stateid_recovery(server, state);
2280                         return -EAGAIN;
2281                 case -NFS4ERR_DELAY:
2282                 case -NFS4ERR_GRACE:
2283                         ssleep(1);
2284                         return -EAGAIN;
2285                 case -ENOMEM:
2286                 case -NFS4ERR_DENIED:
2287                         if (fl) {
2288                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2289                                 if (lsp)
2290                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2291                         }
2292                         return 0;
2293         }
2294         return err;
2295 }
2296
2297 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2298                 struct nfs4_state *state, const nfs4_stateid *stateid)
2299 {
2300         struct nfs_server *server = NFS_SERVER(state->inode);
2301         struct nfs4_opendata *opendata;
2302         int err = 0;
2303
2304         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2305                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2306         if (IS_ERR(opendata))
2307                 return PTR_ERR(opendata);
2308         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2309         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2310                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2311                 if (err)
2312                         goto out;
2313         }
2314         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2315                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2316                 if (err)
2317                         goto out;
2318         }
2319         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2320                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2321                 if (err)
2322                         goto out;
2323         }
2324         nfs_state_clear_delegation(state);
2325 out:
2326         nfs4_opendata_put(opendata);
2327         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2328 }
2329
2330 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2331 {
2332         struct nfs4_opendata *data = calldata;
2333
2334         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2335                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2336 }
2337
2338 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2339 {
2340         struct nfs4_opendata *data = calldata;
2341
2342         nfs40_sequence_done(task, &data->c_res.seq_res);
2343
2344         data->rpc_status = task->tk_status;
2345         if (data->rpc_status == 0) {
2346                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2347                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2348                 renew_lease(data->o_res.server, data->timestamp);
2349                 data->rpc_done = true;
2350         }
2351 }
2352
2353 static void nfs4_open_confirm_release(void *calldata)
2354 {
2355         struct nfs4_opendata *data = calldata;
2356         struct nfs4_state *state = NULL;
2357
2358         /* If this request hasn't been cancelled, do nothing */
2359         if (!data->cancelled)
2360                 goto out_free;
2361         /* In case of error, no cleanup! */
2362         if (!data->rpc_done)
2363                 goto out_free;
2364         state = nfs4_opendata_to_nfs4_state(data);
2365         if (!IS_ERR(state))
2366                 nfs4_close_state(state, data->o_arg.fmode);
2367 out_free:
2368         nfs4_opendata_put(data);
2369 }
2370
2371 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2372         .rpc_call_prepare = nfs4_open_confirm_prepare,
2373         .rpc_call_done = nfs4_open_confirm_done,
2374         .rpc_release = nfs4_open_confirm_release,
2375 };
2376
2377 /*
2378  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2379  */
2380 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2381 {
2382         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2383         struct rpc_task *task;
2384         struct  rpc_message msg = {
2385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2386                 .rpc_argp = &data->c_arg,
2387                 .rpc_resp = &data->c_res,
2388                 .rpc_cred = data->owner->so_cred,
2389         };
2390         struct rpc_task_setup task_setup_data = {
2391                 .rpc_client = server->client,
2392                 .rpc_message = &msg,
2393                 .callback_ops = &nfs4_open_confirm_ops,
2394                 .callback_data = data,
2395                 .workqueue = nfsiod_workqueue,
2396                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2397         };
2398         int status;
2399
2400         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2401                                 data->is_recover);
2402         kref_get(&data->kref);
2403         data->rpc_done = false;
2404         data->rpc_status = 0;
2405         data->timestamp = jiffies;
2406         task = rpc_run_task(&task_setup_data);
2407         if (IS_ERR(task))
2408                 return PTR_ERR(task);
2409         status = rpc_wait_for_completion_task(task);
2410         if (status != 0) {
2411                 data->cancelled = true;
2412                 smp_wmb();
2413         } else
2414                 status = data->rpc_status;
2415         rpc_put_task(task);
2416         return status;
2417 }
2418
2419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2420 {
2421         struct nfs4_opendata *data = calldata;
2422         struct nfs4_state_owner *sp = data->owner;
2423         struct nfs_client *clp = sp->so_server->nfs_client;
2424         enum open_claim_type4 claim = data->o_arg.claim;
2425
2426         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2427                 goto out_wait;
2428         /*
2429          * Check if we still need to send an OPEN call, or if we can use
2430          * a delegation instead.
2431          */
2432         if (data->state != NULL) {
2433                 struct nfs_delegation *delegation;
2434
2435                 if (can_open_cached(data->state, data->o_arg.fmode,
2436                                         data->o_arg.open_flags, claim))
2437                         goto out_no_action;
2438                 rcu_read_lock();
2439                 delegation = nfs4_get_valid_delegation(data->state->inode);
2440                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2441                         goto unlock_no_action;
2442                 rcu_read_unlock();
2443         }
2444         /* Update client id. */
2445         data->o_arg.clientid = clp->cl_clientid;
2446         switch (claim) {
2447         default:
2448                 break;
2449         case NFS4_OPEN_CLAIM_PREVIOUS:
2450         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2451         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2452                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2453                 fallthrough;
2454         case NFS4_OPEN_CLAIM_FH:
2455                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2456         }
2457         data->timestamp = jiffies;
2458         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2459                                 &data->o_arg.seq_args,
2460                                 &data->o_res.seq_res,
2461                                 task) != 0)
2462                 nfs_release_seqid(data->o_arg.seqid);
2463
2464         /* Set the create mode (note dependency on the session type) */
2465         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2466         if (data->o_arg.open_flags & O_EXCL) {
2467                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2468                 if (clp->cl_mvops->minor_version == 0) {
2469                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2470                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2471                          * because ACCESS will return permission denied for
2472                          * all bits until close */
2473                         data->o_res.access_request = data->o_arg.access = 0;
2474                 } else if (nfs4_has_persistent_session(clp))
2475                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2476         }
2477         return;
2478 unlock_no_action:
2479         trace_nfs4_cached_open(data->state);
2480         rcu_read_unlock();
2481 out_no_action:
2482         task->tk_action = NULL;
2483 out_wait:
2484         nfs4_sequence_done(task, &data->o_res.seq_res);
2485 }
2486
2487 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2488 {
2489         struct nfs4_opendata *data = calldata;
2490
2491         data->rpc_status = task->tk_status;
2492
2493         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2494                 return;
2495
2496         if (task->tk_status == 0) {
2497                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2498                         switch (data->o_res.f_attr->mode & S_IFMT) {
2499                         case S_IFREG:
2500                                 break;
2501                         case S_IFLNK:
2502                                 data->rpc_status = -ELOOP;
2503                                 break;
2504                         case S_IFDIR:
2505                                 data->rpc_status = -EISDIR;
2506                                 break;
2507                         default:
2508                                 data->rpc_status = -ENOTDIR;
2509                         }
2510                 }
2511                 renew_lease(data->o_res.server, data->timestamp);
2512                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2513                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2514         }
2515         data->rpc_done = true;
2516 }
2517
2518 static void nfs4_open_release(void *calldata)
2519 {
2520         struct nfs4_opendata *data = calldata;
2521         struct nfs4_state *state = NULL;
2522
2523         /* If this request hasn't been cancelled, do nothing */
2524         if (!data->cancelled)
2525                 goto out_free;
2526         /* In case of error, no cleanup! */
2527         if (data->rpc_status != 0 || !data->rpc_done)
2528                 goto out_free;
2529         /* In case we need an open_confirm, no cleanup! */
2530         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2531                 goto out_free;
2532         state = nfs4_opendata_to_nfs4_state(data);
2533         if (!IS_ERR(state))
2534                 nfs4_close_state(state, data->o_arg.fmode);
2535 out_free:
2536         nfs4_opendata_put(data);
2537 }
2538
2539 static const struct rpc_call_ops nfs4_open_ops = {
2540         .rpc_call_prepare = nfs4_open_prepare,
2541         .rpc_call_done = nfs4_open_done,
2542         .rpc_release = nfs4_open_release,
2543 };
2544
2545 static int nfs4_run_open_task(struct nfs4_opendata *data,
2546                               struct nfs_open_context *ctx)
2547 {
2548         struct inode *dir = d_inode(data->dir);
2549         struct nfs_server *server = NFS_SERVER(dir);
2550         struct nfs_openargs *o_arg = &data->o_arg;
2551         struct nfs_openres *o_res = &data->o_res;
2552         struct rpc_task *task;
2553         struct rpc_message msg = {
2554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2555                 .rpc_argp = o_arg,
2556                 .rpc_resp = o_res,
2557                 .rpc_cred = data->owner->so_cred,
2558         };
2559         struct rpc_task_setup task_setup_data = {
2560                 .rpc_client = server->client,
2561                 .rpc_message = &msg,
2562                 .callback_ops = &nfs4_open_ops,
2563                 .callback_data = data,
2564                 .workqueue = nfsiod_workqueue,
2565                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2566         };
2567         int status;
2568
2569         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2570                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2571
2572         kref_get(&data->kref);
2573         data->rpc_done = false;
2574         data->rpc_status = 0;
2575         data->cancelled = false;
2576         data->is_recover = false;
2577         if (!ctx) {
2578                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2579                 data->is_recover = true;
2580                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2581         } else {
2582                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2583                 pnfs_lgopen_prepare(data, ctx);
2584         }
2585         task = rpc_run_task(&task_setup_data);
2586         if (IS_ERR(task))
2587                 return PTR_ERR(task);
2588         status = rpc_wait_for_completion_task(task);
2589         if (status != 0) {
2590                 data->cancelled = true;
2591                 smp_wmb();
2592         } else
2593                 status = data->rpc_status;
2594         rpc_put_task(task);
2595
2596         return status;
2597 }
2598
2599 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2600 {
2601         struct inode *dir = d_inode(data->dir);
2602         struct nfs_openres *o_res = &data->o_res;
2603         int status;
2604
2605         status = nfs4_run_open_task(data, NULL);
2606         if (status != 0 || !data->rpc_done)
2607                 return status;
2608
2609         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2610
2611         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2612                 status = _nfs4_proc_open_confirm(data);
2613
2614         return status;
2615 }
2616
2617 /*
2618  * Additional permission checks in order to distinguish between an
2619  * open for read, and an open for execute. This works around the
2620  * fact that NFSv4 OPEN treats read and execute permissions as being
2621  * the same.
2622  * Note that in the non-execute case, we want to turn off permission
2623  * checking if we just created a new file (POSIX open() semantics).
2624  */
2625 static int nfs4_opendata_access(const struct cred *cred,
2626                                 struct nfs4_opendata *opendata,
2627                                 struct nfs4_state *state, fmode_t fmode,
2628                                 int openflags)
2629 {
2630         struct nfs_access_entry cache;
2631         u32 mask, flags;
2632
2633         /* access call failed or for some reason the server doesn't
2634          * support any access modes -- defer access call until later */
2635         if (opendata->o_res.access_supported == 0)
2636                 return 0;
2637
2638         mask = 0;
2639         /*
2640          * Use openflags to check for exec, because fmode won't
2641          * always have FMODE_EXEC set when file open for exec.
2642          */
2643         if (openflags & __FMODE_EXEC) {
2644                 /* ONLY check for exec rights */
2645                 if (S_ISDIR(state->inode->i_mode))
2646                         mask = NFS4_ACCESS_LOOKUP;
2647                 else
2648                         mask = NFS4_ACCESS_EXECUTE;
2649         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2650                 mask = NFS4_ACCESS_READ;
2651
2652         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2653         nfs_access_add_cache(state->inode, &cache, cred);
2654
2655         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2656         if ((mask & ~cache.mask & flags) == 0)
2657                 return 0;
2658
2659         return -EACCES;
2660 }
2661
2662 /*
2663  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2664  */
2665 static int _nfs4_proc_open(struct nfs4_opendata *data,
2666                            struct nfs_open_context *ctx)
2667 {
2668         struct inode *dir = d_inode(data->dir);
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         struct nfs_openargs *o_arg = &data->o_arg;
2671         struct nfs_openres *o_res = &data->o_res;
2672         int status;
2673
2674         status = nfs4_run_open_task(data, ctx);
2675         if (!data->rpc_done)
2676                 return status;
2677         if (status != 0) {
2678                 if (status == -NFS4ERR_BADNAME &&
2679                                 !(o_arg->open_flags & O_CREAT))
2680                         return -ENOENT;
2681                 return status;
2682         }
2683
2684         nfs_fattr_map_and_free_names(server, &data->f_attr);
2685
2686         if (o_arg->open_flags & O_CREAT) {
2687                 if (o_arg->open_flags & O_EXCL)
2688                         data->file_created = true;
2689                 else if (o_res->cinfo.before != o_res->cinfo.after)
2690                         data->file_created = true;
2691                 if (data->file_created ||
2692                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2693                         nfs4_update_changeattr(dir, &o_res->cinfo,
2694                                         o_res->f_attr->time_start,
2695                                         NFS_INO_INVALID_DATA);
2696         }
2697         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2698                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2699         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2700                 status = _nfs4_proc_open_confirm(data);
2701                 if (status != 0)
2702                         return status;
2703         }
2704         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2705                 nfs4_sequence_free_slot(&o_res->seq_res);
2706                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2707         }
2708         return 0;
2709 }
2710
2711 /*
2712  * OPEN_EXPIRED:
2713  *      reclaim state on the server after a network partition.
2714  *      Assumes caller holds the appropriate lock
2715  */
2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2717 {
2718         struct nfs4_opendata *opendata;
2719         int ret;
2720
2721         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2722                         NFS4_OPEN_CLAIM_FH);
2723         if (IS_ERR(opendata))
2724                 return PTR_ERR(opendata);
2725         ret = nfs4_open_recover(opendata, state);
2726         if (ret == -ESTALE)
2727                 d_drop(ctx->dentry);
2728         nfs4_opendata_put(opendata);
2729         return ret;
2730 }
2731
2732 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2733 {
2734         struct nfs_server *server = NFS_SERVER(state->inode);
2735         struct nfs4_exception exception = { };
2736         int err;
2737
2738         do {
2739                 err = _nfs4_open_expired(ctx, state);
2740                 trace_nfs4_open_expired(ctx, 0, err);
2741                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2742                         continue;
2743                 switch (err) {
2744                 default:
2745                         goto out;
2746                 case -NFS4ERR_GRACE:
2747                 case -NFS4ERR_DELAY:
2748                         nfs4_handle_exception(server, err, &exception);
2749                         err = 0;
2750                 }
2751         } while (exception.retry);
2752 out:
2753         return err;
2754 }
2755
2756 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2757 {
2758         struct nfs_open_context *ctx;
2759         int ret;
2760
2761         ctx = nfs4_state_find_open_context(state);
2762         if (IS_ERR(ctx))
2763                 return -EAGAIN;
2764         ret = nfs4_do_open_expired(ctx, state);
2765         put_nfs_open_context(ctx);
2766         return ret;
2767 }
2768
2769 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2770                 const nfs4_stateid *stateid)
2771 {
2772         nfs_remove_bad_delegation(state->inode, stateid);
2773         nfs_state_clear_delegation(state);
2774 }
2775
2776 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2777 {
2778         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2779                 nfs_finish_clear_delegation_stateid(state, NULL);
2780 }
2781
2782 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2783 {
2784         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2785         nfs40_clear_delegation_stateid(state);
2786         nfs_state_clear_open_state_flags(state);
2787         return nfs4_open_expired(sp, state);
2788 }
2789
2790 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2791                 nfs4_stateid *stateid,
2792                 const struct cred *cred)
2793 {
2794         return -NFS4ERR_BAD_STATEID;
2795 }
2796
2797 #if defined(CONFIG_NFS_V4_1)
2798 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2799                 nfs4_stateid *stateid,
2800                 const struct cred *cred)
2801 {
2802         int status;
2803
2804         switch (stateid->type) {
2805         default:
2806                 break;
2807         case NFS4_INVALID_STATEID_TYPE:
2808         case NFS4_SPECIAL_STATEID_TYPE:
2809                 return -NFS4ERR_BAD_STATEID;
2810         case NFS4_REVOKED_STATEID_TYPE:
2811                 goto out_free;
2812         }
2813
2814         status = nfs41_test_stateid(server, stateid, cred);
2815         switch (status) {
2816         case -NFS4ERR_EXPIRED:
2817         case -NFS4ERR_ADMIN_REVOKED:
2818         case -NFS4ERR_DELEG_REVOKED:
2819                 break;
2820         default:
2821                 return status;
2822         }
2823 out_free:
2824         /* Ack the revoked state to the server */
2825         nfs41_free_stateid(server, stateid, cred, true);
2826         return -NFS4ERR_EXPIRED;
2827 }
2828
2829 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2830 {
2831         struct nfs_server *server = NFS_SERVER(state->inode);
2832         nfs4_stateid stateid;
2833         struct nfs_delegation *delegation;
2834         const struct cred *cred = NULL;
2835         int status, ret = NFS_OK;
2836
2837         /* Get the delegation credential for use by test/free_stateid */
2838         rcu_read_lock();
2839         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2840         if (delegation == NULL) {
2841                 rcu_read_unlock();
2842                 nfs_state_clear_delegation(state);
2843                 return NFS_OK;
2844         }
2845
2846         spin_lock(&delegation->lock);
2847         nfs4_stateid_copy(&stateid, &delegation->stateid);
2848
2849         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2850                                 &delegation->flags)) {
2851                 spin_unlock(&delegation->lock);
2852                 rcu_read_unlock();
2853                 return NFS_OK;
2854         }
2855
2856         if (delegation->cred)
2857                 cred = get_cred(delegation->cred);
2858         spin_unlock(&delegation->lock);
2859         rcu_read_unlock();
2860         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2861         trace_nfs4_test_delegation_stateid(state, NULL, status);
2862         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2863                 nfs_finish_clear_delegation_stateid(state, &stateid);
2864         else
2865                 ret = status;
2866
2867         put_cred(cred);
2868         return ret;
2869 }
2870
2871 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2872 {
2873         nfs4_stateid tmp;
2874
2875         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2876             nfs4_copy_delegation_stateid(state->inode, state->state,
2877                                 &tmp, NULL) &&
2878             nfs4_stateid_match_other(&state->stateid, &tmp))
2879                 nfs_state_set_delegation(state, &tmp, state->state);
2880         else
2881                 nfs_state_clear_delegation(state);
2882 }
2883
2884 /**
2885  * nfs41_check_expired_locks - possibly free a lock stateid
2886  *
2887  * @state: NFSv4 state for an inode
2888  *
2889  * Returns NFS_OK if recovery for this stateid is now finished.
2890  * Otherwise a negative NFS4ERR value is returned.
2891  */
2892 static int nfs41_check_expired_locks(struct nfs4_state *state)
2893 {
2894         int status, ret = NFS_OK;
2895         struct nfs4_lock_state *lsp, *prev = NULL;
2896         struct nfs_server *server = NFS_SERVER(state->inode);
2897
2898         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2899                 goto out;
2900
2901         spin_lock(&state->state_lock);
2902         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2903                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2904                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2905
2906                         refcount_inc(&lsp->ls_count);
2907                         spin_unlock(&state->state_lock);
2908
2909                         nfs4_put_lock_state(prev);
2910                         prev = lsp;
2911
2912                         status = nfs41_test_and_free_expired_stateid(server,
2913                                         &lsp->ls_stateid,
2914                                         cred);
2915                         trace_nfs4_test_lock_stateid(state, lsp, status);
2916                         if (status == -NFS4ERR_EXPIRED ||
2917                             status == -NFS4ERR_BAD_STATEID) {
2918                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2919                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2920                                 if (!recover_lost_locks)
2921                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2922                         } else if (status != NFS_OK) {
2923                                 ret = status;
2924                                 nfs4_put_lock_state(prev);
2925                                 goto out;
2926                         }
2927                         spin_lock(&state->state_lock);
2928                 }
2929         }
2930         spin_unlock(&state->state_lock);
2931         nfs4_put_lock_state(prev);
2932 out:
2933         return ret;
2934 }
2935
2936 /**
2937  * nfs41_check_open_stateid - possibly free an open stateid
2938  *
2939  * @state: NFSv4 state for an inode
2940  *
2941  * Returns NFS_OK if recovery for this stateid is now finished.
2942  * Otherwise a negative NFS4ERR value is returned.
2943  */
2944 static int nfs41_check_open_stateid(struct nfs4_state *state)
2945 {
2946         struct nfs_server *server = NFS_SERVER(state->inode);
2947         nfs4_stateid *stateid = &state->open_stateid;
2948         const struct cred *cred = state->owner->so_cred;
2949         int status;
2950
2951         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2952                 return -NFS4ERR_BAD_STATEID;
2953         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2954         trace_nfs4_test_open_stateid(state, NULL, status);
2955         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2956                 nfs_state_clear_open_state_flags(state);
2957                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2958                 return status;
2959         }
2960         if (nfs_open_stateid_recover_openmode(state))
2961                 return -NFS4ERR_OPENMODE;
2962         return NFS_OK;
2963 }
2964
2965 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2966 {
2967         int status;
2968
2969         status = nfs41_check_delegation_stateid(state);
2970         if (status != NFS_OK)
2971                 return status;
2972         nfs41_delegation_recover_stateid(state);
2973
2974         status = nfs41_check_expired_locks(state);
2975         if (status != NFS_OK)
2976                 return status;
2977         status = nfs41_check_open_stateid(state);
2978         if (status != NFS_OK)
2979                 status = nfs4_open_expired(sp, state);
2980         return status;
2981 }
2982 #endif
2983
2984 /*
2985  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2986  * fields corresponding to attributes that were used to store the verifier.
2987  * Make sure we clobber those fields in the later setattr call
2988  */
2989 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2990                                 struct iattr *sattr, struct nfs4_label **label)
2991 {
2992         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2993         __u32 attrset[3];
2994         unsigned ret;
2995         unsigned i;
2996
2997         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2998                 attrset[i] = opendata->o_res.attrset[i];
2999                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3000                         attrset[i] &= ~bitmask[i];
3001         }
3002
3003         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3004                 sattr->ia_valid : 0;
3005
3006         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3007                 if (sattr->ia_valid & ATTR_ATIME_SET)
3008                         ret |= ATTR_ATIME_SET;
3009                 else
3010                         ret |= ATTR_ATIME;
3011         }
3012
3013         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3014                 if (sattr->ia_valid & ATTR_MTIME_SET)
3015                         ret |= ATTR_MTIME_SET;
3016                 else
3017                         ret |= ATTR_MTIME;
3018         }
3019
3020         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3021                 *label = NULL;
3022         return ret;
3023 }
3024
3025 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3026                 int flags, struct nfs_open_context *ctx)
3027 {
3028         struct nfs4_state_owner *sp = opendata->owner;
3029         struct nfs_server *server = sp->so_server;
3030         struct dentry *dentry;
3031         struct nfs4_state *state;
3032         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3033         struct inode *dir = d_inode(opendata->dir);
3034         unsigned long dir_verifier;
3035         unsigned int seq;
3036         int ret;
3037
3038         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3039         dir_verifier = nfs_save_change_attribute(dir);
3040
3041         ret = _nfs4_proc_open(opendata, ctx);
3042         if (ret != 0)
3043                 goto out;
3044
3045         state = _nfs4_opendata_to_nfs4_state(opendata);
3046         ret = PTR_ERR(state);
3047         if (IS_ERR(state))
3048                 goto out;
3049         ctx->state = state;
3050         if (server->caps & NFS_CAP_POSIX_LOCK)
3051                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3052         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3053                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3054         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3055                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3056
3057         dentry = opendata->dentry;
3058         if (d_really_is_negative(dentry)) {
3059                 struct dentry *alias;
3060                 d_drop(dentry);
3061                 alias = d_exact_alias(dentry, state->inode);
3062                 if (!alias)
3063                         alias = d_splice_alias(igrab(state->inode), dentry);
3064                 /* d_splice_alias() can't fail here - it's a non-directory */
3065                 if (alias) {
3066                         dput(ctx->dentry);
3067                         ctx->dentry = dentry = alias;
3068                 }
3069         }
3070
3071         switch(opendata->o_arg.claim) {
3072         default:
3073                 break;
3074         case NFS4_OPEN_CLAIM_NULL:
3075         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3076         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3077                 if (!opendata->rpc_done)
3078                         break;
3079                 if (opendata->o_res.delegation_type != 0)
3080                         dir_verifier = nfs_save_change_attribute(dir);
3081                 nfs_set_verifier(dentry, dir_verifier);
3082         }
3083
3084         /* Parse layoutget results before we check for access */
3085         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3086
3087         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3088                         acc_mode, flags);
3089         if (ret != 0)
3090                 goto out;
3091
3092         if (d_inode(dentry) == state->inode) {
3093                 nfs_inode_attach_open_context(ctx);
3094                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3095                         nfs4_schedule_stateid_recovery(server, state);
3096         }
3097
3098 out:
3099         if (!opendata->cancelled) {
3100                 if (opendata->lgp) {
3101                         nfs4_lgopen_release(opendata->lgp);
3102                         opendata->lgp = NULL;
3103                 }
3104                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3105         }
3106         return ret;
3107 }
3108
3109 /*
3110  * Returns a referenced nfs4_state
3111  */
3112 static int _nfs4_do_open(struct inode *dir,
3113                         struct nfs_open_context *ctx,
3114                         int flags,
3115                         const struct nfs4_open_createattrs *c,
3116                         int *opened)
3117 {
3118         struct nfs4_state_owner  *sp;
3119         struct nfs4_state     *state = NULL;
3120         struct nfs_server       *server = NFS_SERVER(dir);
3121         struct nfs4_opendata *opendata;
3122         struct dentry *dentry = ctx->dentry;
3123         const struct cred *cred = ctx->cred;
3124         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3125         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3126         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3127         struct iattr *sattr = c->sattr;
3128         struct nfs4_label *label = c->label;
3129         int status;
3130
3131         /* Protect against reboot recovery conflicts */
3132         status = -ENOMEM;
3133         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3134         if (sp == NULL) {
3135                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3136                 goto out_err;
3137         }
3138         status = nfs4_client_recover_expired_lease(server->nfs_client);
3139         if (status != 0)
3140                 goto err_put_state_owner;
3141         if (d_really_is_positive(dentry))
3142                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3143         status = -ENOMEM;
3144         if (d_really_is_positive(dentry))
3145                 claim = NFS4_OPEN_CLAIM_FH;
3146         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3147                         c, claim, GFP_KERNEL);
3148         if (opendata == NULL)
3149                 goto err_put_state_owner;
3150
3151         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3152                 if (!opendata->f_attr.mdsthreshold) {
3153                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3154                         if (!opendata->f_attr.mdsthreshold)
3155                                 goto err_opendata_put;
3156                 }
3157                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3158         }
3159         if (d_really_is_positive(dentry))
3160                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3161
3162         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3163         if (status != 0)
3164                 goto err_opendata_put;
3165         state = ctx->state;
3166
3167         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3168             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3169                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3170                 /*
3171                  * send create attributes which was not set by open
3172                  * with an extra setattr.
3173                  */
3174                 if (attrs || label) {
3175                         unsigned ia_old = sattr->ia_valid;
3176
3177                         sattr->ia_valid = attrs;
3178                         nfs_fattr_init(opendata->o_res.f_attr);
3179                         status = nfs4_do_setattr(state->inode, cred,
3180                                         opendata->o_res.f_attr, sattr,
3181                                         ctx, label);
3182                         if (status == 0) {
3183                                 nfs_setattr_update_inode(state->inode, sattr,
3184                                                 opendata->o_res.f_attr);
3185                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3186                         }
3187                         sattr->ia_valid = ia_old;
3188                 }
3189         }
3190         if (opened && opendata->file_created)
3191                 *opened = 1;
3192
3193         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3194                 *ctx_th = opendata->f_attr.mdsthreshold;
3195                 opendata->f_attr.mdsthreshold = NULL;
3196         }
3197
3198         nfs4_opendata_put(opendata);
3199         nfs4_put_state_owner(sp);
3200         return 0;
3201 err_opendata_put:
3202         nfs4_opendata_put(opendata);
3203 err_put_state_owner:
3204         nfs4_put_state_owner(sp);
3205 out_err:
3206         return status;
3207 }
3208
3209
3210 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3211                                         struct nfs_open_context *ctx,
3212                                         int flags,
3213                                         struct iattr *sattr,
3214                                         struct nfs4_label *label,
3215                                         int *opened)
3216 {
3217         struct nfs_server *server = NFS_SERVER(dir);
3218         struct nfs4_exception exception = {
3219                 .interruptible = true,
3220         };
3221         struct nfs4_state *res;
3222         struct nfs4_open_createattrs c = {
3223                 .label = label,
3224                 .sattr = sattr,
3225                 .verf = {
3226                         [0] = (__u32)jiffies,
3227                         [1] = (__u32)current->pid,
3228                 },
3229         };
3230         int status;
3231
3232         do {
3233                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3234                 res = ctx->state;
3235                 trace_nfs4_open_file(ctx, flags, status);
3236                 if (status == 0)
3237                         break;
3238                 /* NOTE: BAD_SEQID means the server and client disagree about the
3239                  * book-keeping w.r.t. state-changing operations
3240                  * (OPEN/CLOSE/LOCK/LOCKU...)
3241                  * It is actually a sign of a bug on the client or on the server.
3242                  *
3243                  * If we receive a BAD_SEQID error in the particular case of
3244                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3245                  * have unhashed the old state_owner for us, and that we can
3246                  * therefore safely retry using a new one. We should still warn
3247                  * the user though...
3248                  */
3249                 if (status == -NFS4ERR_BAD_SEQID) {
3250                         pr_warn_ratelimited("NFS: v4 server %s "
3251                                         " returned a bad sequence-id error!\n",
3252                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3253                         exception.retry = 1;
3254                         continue;
3255                 }
3256                 /*
3257                  * BAD_STATEID on OPEN means that the server cancelled our
3258                  * state before it received the OPEN_CONFIRM.
3259                  * Recover by retrying the request as per the discussion
3260                  * on Page 181 of RFC3530.
3261                  */
3262                 if (status == -NFS4ERR_BAD_STATEID) {
3263                         exception.retry = 1;
3264                         continue;
3265                 }
3266                 if (status == -NFS4ERR_EXPIRED) {
3267                         nfs4_schedule_lease_recovery(server->nfs_client);
3268                         exception.retry = 1;
3269                         continue;
3270                 }
3271                 if (status == -EAGAIN) {
3272                         /* We must have found a delegation */
3273                         exception.retry = 1;
3274                         continue;
3275                 }
3276                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3277                         continue;
3278                 res = ERR_PTR(nfs4_handle_exception(server,
3279                                         status, &exception));
3280         } while (exception.retry);
3281         return res;
3282 }
3283
3284 static int _nfs4_do_setattr(struct inode *inode,
3285                             struct nfs_setattrargs *arg,
3286                             struct nfs_setattrres *res,
3287                             const struct cred *cred,
3288                             struct nfs_open_context *ctx)
3289 {
3290         struct nfs_server *server = NFS_SERVER(inode);
3291         struct rpc_message msg = {
3292                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3293                 .rpc_argp       = arg,
3294                 .rpc_resp       = res,
3295                 .rpc_cred       = cred,
3296         };
3297         const struct cred *delegation_cred = NULL;
3298         unsigned long timestamp = jiffies;
3299         bool truncate;
3300         int status;
3301
3302         nfs_fattr_init(res->fattr);
3303
3304         /* Servers should only apply open mode checks for file size changes */
3305         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3306         if (!truncate) {
3307                 nfs4_inode_make_writeable(inode);
3308                 goto zero_stateid;
3309         }
3310
3311         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3312                 /* Use that stateid */
3313         } else if (ctx != NULL && ctx->state) {
3314                 struct nfs_lock_context *l_ctx;
3315                 if (!nfs4_valid_open_stateid(ctx->state))
3316                         return -EBADF;
3317                 l_ctx = nfs_get_lock_context(ctx);
3318                 if (IS_ERR(l_ctx))
3319                         return PTR_ERR(l_ctx);
3320                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3321                                                 &arg->stateid, &delegation_cred);
3322                 nfs_put_lock_context(l_ctx);
3323                 if (status == -EIO)
3324                         return -EBADF;
3325                 else if (status == -EAGAIN)
3326                         goto zero_stateid;
3327         } else {
3328 zero_stateid:
3329                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3330         }
3331         if (delegation_cred)
3332                 msg.rpc_cred = delegation_cred;
3333
3334         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3335
3336         put_cred(delegation_cred);
3337         if (status == 0 && ctx != NULL)
3338                 renew_lease(server, timestamp);
3339         trace_nfs4_setattr(inode, &arg->stateid, status);
3340         return status;
3341 }
3342
3343 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3344                            struct nfs_fattr *fattr, struct iattr *sattr,
3345                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3346 {
3347         struct nfs_server *server = NFS_SERVER(inode);
3348         __u32 bitmask[NFS4_BITMASK_SZ];
3349         struct nfs4_state *state = ctx ? ctx->state : NULL;
3350         struct nfs_setattrargs  arg = {
3351                 .fh             = NFS_FH(inode),
3352                 .iap            = sattr,
3353                 .server         = server,
3354                 .bitmask = bitmask,
3355                 .label          = ilabel,
3356         };
3357         struct nfs_setattrres  res = {
3358                 .fattr          = fattr,
3359                 .server         = server,
3360         };
3361         struct nfs4_exception exception = {
3362                 .state = state,
3363                 .inode = inode,
3364                 .stateid = &arg.stateid,
3365         };
3366         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3367         int err;
3368
3369         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3370                 adjust_flags |= NFS_INO_INVALID_MODE;
3371         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3372                 adjust_flags |= NFS_INO_INVALID_OTHER;
3373
3374         do {
3375                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3376                                         inode, adjust_flags);
3377
3378                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3379                 switch (err) {
3380                 case -NFS4ERR_OPENMODE:
3381                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3382                                 pr_warn_once("NFSv4: server %s is incorrectly "
3383                                                 "applying open mode checks to "
3384                                                 "a SETATTR that is not "
3385                                                 "changing file size.\n",
3386                                                 server->nfs_client->cl_hostname);
3387                         }
3388                         if (state && !(state->state & FMODE_WRITE)) {
3389                                 err = -EBADF;
3390                                 if (sattr->ia_valid & ATTR_OPEN)
3391                                         err = -EACCES;
3392                                 goto out;
3393                         }
3394                 }
3395                 err = nfs4_handle_exception(server, err, &exception);
3396         } while (exception.retry);
3397 out:
3398         return err;
3399 }
3400
3401 static bool
3402 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3403 {
3404         if (inode == NULL || !nfs_have_layout(inode))
3405                 return false;
3406
3407         return pnfs_wait_on_layoutreturn(inode, task);
3408 }
3409
3410 /*
3411  * Update the seqid of an open stateid
3412  */
3413 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3414                 struct nfs4_state *state)
3415 {
3416         __be32 seqid_open;
3417         u32 dst_seqid;
3418         int seq;
3419
3420         for (;;) {
3421                 if (!nfs4_valid_open_stateid(state))
3422                         break;
3423                 seq = read_seqbegin(&state->seqlock);
3424                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3425                         nfs4_stateid_copy(dst, &state->open_stateid);
3426                         if (read_seqretry(&state->seqlock, seq))
3427                                 continue;
3428                         break;
3429                 }
3430                 seqid_open = state->open_stateid.seqid;
3431                 if (read_seqretry(&state->seqlock, seq))
3432                         continue;
3433
3434                 dst_seqid = be32_to_cpu(dst->seqid);
3435                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3436                         dst->seqid = seqid_open;
3437                 break;
3438         }
3439 }
3440
3441 /*
3442  * Update the seqid of an open stateid after receiving
3443  * NFS4ERR_OLD_STATEID
3444  */
3445 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3446                 struct nfs4_state *state)
3447 {
3448         __be32 seqid_open;
3449         u32 dst_seqid;
3450         bool ret;
3451         int seq, status = -EAGAIN;
3452         DEFINE_WAIT(wait);
3453
3454         for (;;) {
3455                 ret = false;
3456                 if (!nfs4_valid_open_stateid(state))
3457                         break;
3458                 seq = read_seqbegin(&state->seqlock);
3459                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3460                         if (read_seqretry(&state->seqlock, seq))
3461                                 continue;
3462                         break;
3463                 }
3464
3465                 write_seqlock(&state->seqlock);
3466                 seqid_open = state->open_stateid.seqid;
3467
3468                 dst_seqid = be32_to_cpu(dst->seqid);
3469
3470                 /* Did another OPEN bump the state's seqid?  try again: */
3471                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3472                         dst->seqid = seqid_open;
3473                         write_sequnlock(&state->seqlock);
3474                         ret = true;
3475                         break;
3476                 }
3477
3478                 /* server says we're behind but we haven't seen the update yet */
3479                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3480                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3481                 write_sequnlock(&state->seqlock);
3482                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3483
3484                 if (fatal_signal_pending(current))
3485                         status = -EINTR;
3486                 else
3487                         if (schedule_timeout(5*HZ) != 0)
3488                                 status = 0;
3489
3490                 finish_wait(&state->waitq, &wait);
3491
3492                 if (!status)
3493                         continue;
3494                 if (status == -EINTR)
3495                         break;
3496
3497                 /* we slept the whole 5 seconds, we must have lost a seqid */
3498                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3499                 ret = true;
3500                 break;
3501         }
3502
3503         return ret;
3504 }
3505
3506 struct nfs4_closedata {
3507         struct inode *inode;
3508         struct nfs4_state *state;
3509         struct nfs_closeargs arg;
3510         struct nfs_closeres res;
3511         struct {
3512                 struct nfs4_layoutreturn_args arg;
3513                 struct nfs4_layoutreturn_res res;
3514                 struct nfs4_xdr_opaque_data ld_private;
3515                 u32 roc_barrier;
3516                 bool roc;
3517         } lr;
3518         struct nfs_fattr fattr;
3519         unsigned long timestamp;
3520 };
3521
3522 static void nfs4_free_closedata(void *data)
3523 {
3524         struct nfs4_closedata *calldata = data;
3525         struct nfs4_state_owner *sp = calldata->state->owner;
3526         struct super_block *sb = calldata->state->inode->i_sb;
3527
3528         if (calldata->lr.roc)
3529                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3530                                 calldata->res.lr_ret);
3531         nfs4_put_open_state(calldata->state);
3532         nfs_free_seqid(calldata->arg.seqid);
3533         nfs4_put_state_owner(sp);
3534         nfs_sb_deactive(sb);
3535         kfree(calldata);
3536 }
3537
3538 static void nfs4_close_done(struct rpc_task *task, void *data)
3539 {
3540         struct nfs4_closedata *calldata = data;
3541         struct nfs4_state *state = calldata->state;
3542         struct nfs_server *server = NFS_SERVER(calldata->inode);
3543         nfs4_stateid *res_stateid = NULL;
3544         struct nfs4_exception exception = {
3545                 .state = state,
3546                 .inode = calldata->inode,
3547                 .stateid = &calldata->arg.stateid,
3548         };
3549
3550         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3551                 return;
3552         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3553
3554         /* Handle Layoutreturn errors */
3555         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3556                           &calldata->res.lr_ret) == -EAGAIN)
3557                 goto out_restart;
3558
3559         /* hmm. we are done with the inode, and in the process of freeing
3560          * the state_owner. we keep this around to process errors
3561          */
3562         switch (task->tk_status) {
3563                 case 0:
3564                         res_stateid = &calldata->res.stateid;
3565                         renew_lease(server, calldata->timestamp);
3566                         break;
3567                 case -NFS4ERR_ACCESS:
3568                         if (calldata->arg.bitmask != NULL) {
3569                                 calldata->arg.bitmask = NULL;
3570                                 calldata->res.fattr = NULL;
3571                                 goto out_restart;
3572
3573                         }
3574                         break;
3575                 case -NFS4ERR_OLD_STATEID:
3576                         /* Did we race with OPEN? */
3577                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3578                                                 state))
3579                                 goto out_restart;
3580                         goto out_release;
3581                 case -NFS4ERR_ADMIN_REVOKED:
3582                 case -NFS4ERR_STALE_STATEID:
3583                 case -NFS4ERR_EXPIRED:
3584                         nfs4_free_revoked_stateid(server,
3585                                         &calldata->arg.stateid,
3586                                         task->tk_msg.rpc_cred);
3587                         fallthrough;
3588                 case -NFS4ERR_BAD_STATEID:
3589                         if (calldata->arg.fmode == 0)
3590                                 break;
3591                         fallthrough;
3592                 default:
3593                         task->tk_status = nfs4_async_handle_exception(task,
3594                                         server, task->tk_status, &exception);
3595                         if (exception.retry)
3596                                 goto out_restart;
3597         }
3598         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3599                         res_stateid, calldata->arg.fmode);
3600 out_release:
3601         task->tk_status = 0;
3602         nfs_release_seqid(calldata->arg.seqid);
3603         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3604         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3605         return;
3606 out_restart:
3607         task->tk_status = 0;
3608         rpc_restart_call_prepare(task);
3609         goto out_release;
3610 }
3611
3612 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3613 {
3614         struct nfs4_closedata *calldata = data;
3615         struct nfs4_state *state = calldata->state;
3616         struct inode *inode = calldata->inode;
3617         struct nfs_server *server = NFS_SERVER(inode);
3618         struct pnfs_layout_hdr *lo;
3619         bool is_rdonly, is_wronly, is_rdwr;
3620         int call_close = 0;
3621
3622         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3623                 goto out_wait;
3624
3625         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3626         spin_lock(&state->owner->so_lock);
3627         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3628         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3629         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3630         /* Calculate the change in open mode */
3631         calldata->arg.fmode = 0;
3632         if (state->n_rdwr == 0) {
3633                 if (state->n_rdonly == 0)
3634                         call_close |= is_rdonly;
3635                 else if (is_rdonly)
3636                         calldata->arg.fmode |= FMODE_READ;
3637                 if (state->n_wronly == 0)
3638                         call_close |= is_wronly;
3639                 else if (is_wronly)
3640                         calldata->arg.fmode |= FMODE_WRITE;
3641                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3642                         call_close |= is_rdwr;
3643         } else if (is_rdwr)
3644                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3645
3646         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3647         if (!nfs4_valid_open_stateid(state))
3648                 call_close = 0;
3649         spin_unlock(&state->owner->so_lock);
3650
3651         if (!call_close) {
3652                 /* Note: exit _without_ calling nfs4_close_done */
3653                 goto out_no_action;
3654         }
3655
3656         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3657                 nfs_release_seqid(calldata->arg.seqid);
3658                 goto out_wait;
3659         }
3660
3661         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3662         if (lo && !pnfs_layout_is_valid(lo)) {
3663                 calldata->arg.lr_args = NULL;
3664                 calldata->res.lr_res = NULL;
3665         }
3666
3667         if (calldata->arg.fmode == 0)
3668                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3669
3670         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3671                 /* Close-to-open cache consistency revalidation */
3672                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3673                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3674                                          server->cache_consistency_bitmask,
3675                                          inode, 0);
3676                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3677                 } else
3678                         calldata->arg.bitmask = NULL;
3679         }
3680
3681         calldata->arg.share_access =
3682                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3683                                 calldata->arg.fmode, 0);
3684
3685         if (calldata->res.fattr == NULL)
3686                 calldata->arg.bitmask = NULL;
3687         else if (calldata->arg.bitmask == NULL)
3688                 calldata->res.fattr = NULL;
3689         calldata->timestamp = jiffies;
3690         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3691                                 &calldata->arg.seq_args,
3692                                 &calldata->res.seq_res,
3693                                 task) != 0)
3694                 nfs_release_seqid(calldata->arg.seqid);
3695         return;
3696 out_no_action:
3697         task->tk_action = NULL;
3698 out_wait:
3699         nfs4_sequence_done(task, &calldata->res.seq_res);
3700 }
3701
3702 static const struct rpc_call_ops nfs4_close_ops = {
3703         .rpc_call_prepare = nfs4_close_prepare,
3704         .rpc_call_done = nfs4_close_done,
3705         .rpc_release = nfs4_free_closedata,
3706 };
3707
3708 /*
3709  * It is possible for data to be read/written from a mem-mapped file
3710  * after the sys_close call (which hits the vfs layer as a flush).
3711  * This means that we can't safely call nfsv4 close on a file until
3712  * the inode is cleared. This in turn means that we are not good
3713  * NFSv4 citizens - we do not indicate to the server to update the file's
3714  * share state even when we are done with one of the three share
3715  * stateid's in the inode.
3716  *
3717  * NOTE: Caller must be holding the sp->so_owner semaphore!
3718  */
3719 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3720 {
3721         struct nfs_server *server = NFS_SERVER(state->inode);
3722         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3723         struct nfs4_closedata *calldata;
3724         struct nfs4_state_owner *sp = state->owner;
3725         struct rpc_task *task;
3726         struct rpc_message msg = {
3727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3728                 .rpc_cred = state->owner->so_cred,
3729         };
3730         struct rpc_task_setup task_setup_data = {
3731                 .rpc_client = server->client,
3732                 .rpc_message = &msg,
3733                 .callback_ops = &nfs4_close_ops,
3734                 .workqueue = nfsiod_workqueue,
3735                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3736         };
3737         int status = -ENOMEM;
3738
3739         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3740                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3741
3742         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3743                 &task_setup_data.rpc_client, &msg);
3744
3745         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3746         if (calldata == NULL)
3747                 goto out;
3748         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3749         calldata->inode = state->inode;
3750         calldata->state = state;
3751         calldata->arg.fh = NFS_FH(state->inode);
3752         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3753                 goto out_free_calldata;
3754         /* Serialization for the sequence id */
3755         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3756         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3757         if (IS_ERR(calldata->arg.seqid))
3758                 goto out_free_calldata;
3759         nfs_fattr_init(&calldata->fattr);
3760         calldata->arg.fmode = 0;
3761         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3762         calldata->res.fattr = &calldata->fattr;
3763         calldata->res.seqid = calldata->arg.seqid;
3764         calldata->res.server = server;
3765         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3766         calldata->lr.roc = pnfs_roc(state->inode,
3767                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3768         if (calldata->lr.roc) {
3769                 calldata->arg.lr_args = &calldata->lr.arg;
3770                 calldata->res.lr_res = &calldata->lr.res;
3771         }
3772         nfs_sb_active(calldata->inode->i_sb);
3773
3774         msg.rpc_argp = &calldata->arg;
3775         msg.rpc_resp = &calldata->res;
3776         task_setup_data.callback_data = calldata;
3777         task = rpc_run_task(&task_setup_data);
3778         if (IS_ERR(task))
3779                 return PTR_ERR(task);
3780         status = 0;
3781         if (wait)
3782                 status = rpc_wait_for_completion_task(task);
3783         rpc_put_task(task);
3784         return status;
3785 out_free_calldata:
3786         kfree(calldata);
3787 out:
3788         nfs4_put_open_state(state);
3789         nfs4_put_state_owner(sp);
3790         return status;
3791 }
3792
3793 static struct inode *
3794 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3795                 int open_flags, struct iattr *attr, int *opened)
3796 {
3797         struct nfs4_state *state;
3798         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3799
3800         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3801
3802         /* Protect against concurrent sillydeletes */
3803         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3804
3805         nfs4_label_release_security(label);
3806
3807         if (IS_ERR(state))
3808                 return ERR_CAST(state);
3809         return state->inode;
3810 }
3811
3812 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3813 {
3814         if (ctx->state == NULL)
3815                 return;
3816         if (is_sync)
3817                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3818         else
3819                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3820 }
3821
3822 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3823 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3824 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3825
3826 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3827 {
3828         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3829         struct nfs4_server_caps_arg args = {
3830                 .fhandle = fhandle,
3831                 .bitmask = bitmask,
3832         };
3833         struct nfs4_server_caps_res res = {};
3834         struct rpc_message msg = {
3835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3836                 .rpc_argp = &args,
3837                 .rpc_resp = &res,
3838         };
3839         int status;
3840         int i;
3841
3842         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3843                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3844                      FATTR4_WORD0_LINK_SUPPORT |
3845                      FATTR4_WORD0_SYMLINK_SUPPORT |
3846                      FATTR4_WORD0_ACLSUPPORT |
3847                      FATTR4_WORD0_CASE_INSENSITIVE |
3848                      FATTR4_WORD0_CASE_PRESERVING;
3849         if (minorversion)
3850                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3851
3852         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3853         if (status == 0) {
3854                 /* Sanity check the server answers */
3855                 switch (minorversion) {
3856                 case 0:
3857                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3858                         res.attr_bitmask[2] = 0;
3859                         break;
3860                 case 1:
3861                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3862                         break;
3863                 case 2:
3864                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3865                 }
3866                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3867                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3868                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3869                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3870                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3871                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3872                         server->caps |= NFS_CAP_ACLS;
3873                 if (res.has_links != 0)
3874                         server->caps |= NFS_CAP_HARDLINKS;
3875                 if (res.has_symlinks != 0)
3876                         server->caps |= NFS_CAP_SYMLINKS;
3877                 if (res.case_insensitive)
3878                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3879                 if (res.case_preserving)
3880                         server->caps |= NFS_CAP_CASE_PRESERVING;
3881 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3882                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3883                         server->caps |= NFS_CAP_SECURITY_LABEL;
3884 #endif
3885                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3886                         server->caps |= NFS_CAP_FS_LOCATIONS;
3887                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3888                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3889                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3890                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3891                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3892                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3893                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3894                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3895                                 NFS_ATTR_FATTR_OWNER_NAME);
3896                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3897                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3898                                 NFS_ATTR_FATTR_GROUP_NAME);
3899                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3900                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3901                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3902                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3903                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3904                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3905                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3906                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3907                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3908                                 sizeof(server->attr_bitmask));
3909                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3910
3911                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3912                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3913                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3914                 server->cache_consistency_bitmask[2] = 0;
3915
3916                 /* Avoid a regression due to buggy server */
3917                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3918                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3919                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3920                         sizeof(server->exclcreat_bitmask));
3921
3922                 server->acl_bitmask = res.acl_bitmask;
3923                 server->fh_expire_type = res.fh_expire_type;
3924         }
3925
3926         return status;
3927 }
3928
3929 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3930 {
3931         struct nfs4_exception exception = {
3932                 .interruptible = true,
3933         };
3934         int err;
3935
3936         nfs4_server_set_init_caps(server);
3937         do {
3938                 err = nfs4_handle_exception(server,
3939                                 _nfs4_server_capabilities(server, fhandle),
3940                                 &exception);
3941         } while (exception.retry);
3942         return err;
3943 }
3944
3945 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3946                                           struct nfs_client *clp,
3947                                           struct nfs_server *server)
3948 {
3949         int i;
3950
3951         for (i = 0; i < location->nservers; i++) {
3952                 struct nfs4_string *srv_loc = &location->servers[i];
3953                 struct sockaddr addr;
3954                 size_t addrlen;
3955                 struct xprt_create xprt_args = {
3956                         .ident = 0,
3957                         .net = clp->cl_net,
3958                 };
3959                 struct nfs4_add_xprt_data xprtdata = {
3960                         .clp = clp,
3961                 };
3962                 struct rpc_add_xprt_test rpcdata = {
3963                         .add_xprt_test = clp->cl_mvops->session_trunk,
3964                         .data = &xprtdata,
3965                 };
3966                 char *servername = NULL;
3967
3968                 if (!srv_loc->len)
3969                         continue;
3970
3971                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3972                                                 &addr, sizeof(addr),
3973                                                 clp->cl_net, server->port);
3974                 if (!addrlen)
3975                         return;
3976                 xprt_args.dstaddr = &addr;
3977                 xprt_args.addrlen = addrlen;
3978                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3979                 if (!servername)
3980                         return;
3981                 memcpy(servername, srv_loc->data, srv_loc->len);
3982                 servername[srv_loc->len] = '\0';
3983                 xprt_args.servername = servername;
3984
3985                 xprtdata.cred = nfs4_get_clid_cred(clp);
3986                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3987                                   rpc_clnt_setup_test_and_add_xprt,
3988                                   &rpcdata);
3989                 if (xprtdata.cred)
3990                         put_cred(xprtdata.cred);
3991                 kfree(servername);
3992         }
3993 }
3994
3995 static int _nfs4_discover_trunking(struct nfs_server *server,
3996                                    struct nfs_fh *fhandle)
3997 {
3998         struct nfs4_fs_locations *locations = NULL;
3999         struct page *page;
4000         const struct cred *cred;
4001         struct nfs_client *clp = server->nfs_client;
4002         const struct nfs4_state_maintenance_ops *ops =
4003                 clp->cl_mvops->state_renewal_ops;
4004         int status = -ENOMEM, i;
4005
4006         cred = ops->get_state_renewal_cred(clp);
4007         if (cred == NULL) {
4008                 cred = nfs4_get_clid_cred(clp);
4009                 if (cred == NULL)
4010                         return -ENOKEY;
4011         }
4012
4013         page = alloc_page(GFP_KERNEL);
4014         if (!page)
4015                 return -ENOMEM;
4016         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4017         if (!locations)
4018                 goto out_free;
4019         locations->fattr = nfs_alloc_fattr();
4020         if (!locations->fattr)
4021                 goto out_free_2;
4022
4023         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4024                                          cred);
4025         if (status)
4026                 goto out_free_3;
4027
4028         for (i = 0; i < locations->nlocations; i++)
4029                 test_fs_location_for_trunking(&locations->locations[i], clp,
4030                                               server);
4031 out_free_3:
4032         kfree(locations->fattr);
4033 out_free_2:
4034         kfree(locations);
4035 out_free:
4036         __free_page(page);
4037         return status;
4038 }
4039
4040 static int nfs4_discover_trunking(struct nfs_server *server,
4041                                   struct nfs_fh *fhandle)
4042 {
4043         struct nfs4_exception exception = {
4044                 .interruptible = true,
4045         };
4046         struct nfs_client *clp = server->nfs_client;
4047         int err = 0;
4048
4049         if (!nfs4_has_session(clp))
4050                 goto out;
4051         do {
4052                 err = nfs4_handle_exception(server,
4053                                 _nfs4_discover_trunking(server, fhandle),
4054                                 &exception);
4055         } while (exception.retry);
4056 out:
4057         return err;
4058 }
4059
4060 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4061                 struct nfs_fsinfo *info)
4062 {
4063         u32 bitmask[3];
4064         struct nfs4_lookup_root_arg args = {
4065                 .bitmask = bitmask,
4066         };
4067         struct nfs4_lookup_res res = {
4068                 .server = server,
4069                 .fattr = info->fattr,
4070                 .fh = fhandle,
4071         };
4072         struct rpc_message msg = {
4073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4074                 .rpc_argp = &args,
4075                 .rpc_resp = &res,
4076         };
4077
4078         bitmask[0] = nfs4_fattr_bitmap[0];
4079         bitmask[1] = nfs4_fattr_bitmap[1];
4080         /*
4081          * Process the label in the upcoming getfattr
4082          */
4083         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4084
4085         nfs_fattr_init(info->fattr);
4086         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4087 }
4088
4089 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4090                 struct nfs_fsinfo *info)
4091 {
4092         struct nfs4_exception exception = {
4093                 .interruptible = true,
4094         };
4095         int err;
4096         do {
4097                 err = _nfs4_lookup_root(server, fhandle, info);
4098                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4099                 switch (err) {
4100                 case 0:
4101                 case -NFS4ERR_WRONGSEC:
4102                         goto out;
4103                 default:
4104                         err = nfs4_handle_exception(server, err, &exception);
4105                 }
4106         } while (exception.retry);
4107 out:
4108         return err;
4109 }
4110
4111 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4112                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4113 {
4114         struct rpc_auth_create_args auth_args = {
4115                 .pseudoflavor = flavor,
4116         };
4117         struct rpc_auth *auth;
4118
4119         auth = rpcauth_create(&auth_args, server->client);
4120         if (IS_ERR(auth))
4121                 return -EACCES;
4122         return nfs4_lookup_root(server, fhandle, info);
4123 }
4124
4125 /*
4126  * Retry pseudoroot lookup with various security flavors.  We do this when:
4127  *
4128  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4129  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4130  *
4131  * Returns zero on success, or a negative NFS4ERR value, or a
4132  * negative errno value.
4133  */
4134 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4135                               struct nfs_fsinfo *info)
4136 {
4137         /* Per 3530bis 15.33.5 */
4138         static const rpc_authflavor_t flav_array[] = {
4139                 RPC_AUTH_GSS_KRB5P,
4140                 RPC_AUTH_GSS_KRB5I,
4141                 RPC_AUTH_GSS_KRB5,
4142                 RPC_AUTH_UNIX,                  /* courtesy */
4143                 RPC_AUTH_NULL,
4144         };
4145         int status = -EPERM;
4146         size_t i;
4147
4148         if (server->auth_info.flavor_len > 0) {
4149                 /* try each flavor specified by user */
4150                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4151                         status = nfs4_lookup_root_sec(server, fhandle, info,
4152                                                 server->auth_info.flavors[i]);
4153                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4154                                 continue;
4155                         break;
4156                 }
4157         } else {
4158                 /* no flavors specified by user, try default list */
4159                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4160                         status = nfs4_lookup_root_sec(server, fhandle, info,
4161                                                       flav_array[i]);
4162                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4163                                 continue;
4164                         break;
4165                 }
4166         }
4167
4168         /*
4169          * -EACCES could mean that the user doesn't have correct permissions
4170          * to access the mount.  It could also mean that we tried to mount
4171          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4172          * existing mount programs don't handle -EACCES very well so it should
4173          * be mapped to -EPERM instead.
4174          */
4175         if (status == -EACCES)
4176                 status = -EPERM;
4177         return status;
4178 }
4179
4180 /**
4181  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4182  * @server: initialized nfs_server handle
4183  * @fhandle: we fill in the pseudo-fs root file handle
4184  * @info: we fill in an FSINFO struct
4185  * @auth_probe: probe the auth flavours
4186  *
4187  * Returns zero on success, or a negative errno.
4188  */
4189 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4190                          struct nfs_fsinfo *info,
4191                          bool auth_probe)
4192 {
4193         int status = 0;
4194
4195         if (!auth_probe)
4196                 status = nfs4_lookup_root(server, fhandle, info);
4197
4198         if (auth_probe || status == NFS4ERR_WRONGSEC)
4199                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4200                                 fhandle, info);
4201
4202         if (status == 0)
4203                 status = nfs4_server_capabilities(server, fhandle);
4204         if (status == 0)
4205                 status = nfs4_do_fsinfo(server, fhandle, info);
4206
4207         return nfs4_map_errors(status);
4208 }
4209
4210 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4211                               struct nfs_fsinfo *info)
4212 {
4213         int error;
4214         struct nfs_fattr *fattr = info->fattr;
4215
4216         error = nfs4_server_capabilities(server, mntfh);
4217         if (error < 0) {
4218                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4219                 return error;
4220         }
4221
4222         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4223         if (error < 0) {
4224                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4225                 goto out;
4226         }
4227
4228         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4229             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4230                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4231
4232 out:
4233         return error;
4234 }
4235
4236 /*
4237  * Get locations and (maybe) other attributes of a referral.
4238  * Note that we'll actually follow the referral later when
4239  * we detect fsid mismatch in inode revalidation
4240  */
4241 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4242                              const struct qstr *name, struct nfs_fattr *fattr,
4243                              struct nfs_fh *fhandle)
4244 {
4245         int status = -ENOMEM;
4246         struct page *page = NULL;
4247         struct nfs4_fs_locations *locations = NULL;
4248
4249         page = alloc_page(GFP_KERNEL);
4250         if (page == NULL)
4251                 goto out;
4252         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4253         if (locations == NULL)
4254                 goto out;
4255
4256         locations->fattr = fattr;
4257
4258         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4259         if (status != 0)
4260                 goto out;
4261
4262         /*
4263          * If the fsid didn't change, this is a migration event, not a
4264          * referral.  Cause us to drop into the exception handler, which
4265          * will kick off migration recovery.
4266          */
4267         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4268                 dprintk("%s: server did not return a different fsid for"
4269                         " a referral at %s\n", __func__, name->name);
4270                 status = -NFS4ERR_MOVED;
4271                 goto out;
4272         }
4273         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4274         nfs_fixup_referral_attributes(fattr);
4275         memset(fhandle, 0, sizeof(struct nfs_fh));
4276 out:
4277         if (page)
4278                 __free_page(page);
4279         kfree(locations);
4280         return status;
4281 }
4282
4283 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4284                                 struct nfs_fattr *fattr, struct inode *inode)
4285 {
4286         __u32 bitmask[NFS4_BITMASK_SZ];
4287         struct nfs4_getattr_arg args = {
4288                 .fh = fhandle,
4289                 .bitmask = bitmask,
4290         };
4291         struct nfs4_getattr_res res = {
4292                 .fattr = fattr,
4293                 .server = server,
4294         };
4295         struct rpc_message msg = {
4296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4297                 .rpc_argp = &args,
4298                 .rpc_resp = &res,
4299         };
4300         unsigned short task_flags = 0;
4301
4302         if (nfs4_has_session(server->nfs_client))
4303                 task_flags = RPC_TASK_MOVEABLE;
4304
4305         /* Is this is an attribute revalidation, subject to softreval? */
4306         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4307                 task_flags |= RPC_TASK_TIMEOUT;
4308
4309         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4310         nfs_fattr_init(fattr);
4311         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4312         return nfs4_do_call_sync(server->client, server, &msg,
4313                         &args.seq_args, &res.seq_res, task_flags);
4314 }
4315
4316 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4317                                 struct nfs_fattr *fattr, struct inode *inode)
4318 {
4319         struct nfs4_exception exception = {
4320                 .interruptible = true,
4321         };
4322         int err;
4323         do {
4324                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4325                 trace_nfs4_getattr(server, fhandle, fattr, err);
4326                 err = nfs4_handle_exception(server, err,
4327                                 &exception);
4328         } while (exception.retry);
4329         return err;
4330 }
4331
4332 /*
4333  * The file is not closed if it is opened due to the a request to change
4334  * the size of the file. The open call will not be needed once the
4335  * VFS layer lookup-intents are implemented.
4336  *
4337  * Close is called when the inode is destroyed.
4338  * If we haven't opened the file for O_WRONLY, we
4339  * need to in the size_change case to obtain a stateid.
4340  *
4341  * Got race?
4342  * Because OPEN is always done by name in nfsv4, it is
4343  * possible that we opened a different file by the same
4344  * name.  We can recognize this race condition, but we
4345  * can't do anything about it besides returning an error.
4346  *
4347  * This will be fixed with VFS changes (lookup-intent).
4348  */
4349 static int
4350 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4351                   struct iattr *sattr)
4352 {
4353         struct inode *inode = d_inode(dentry);
4354         const struct cred *cred = NULL;
4355         struct nfs_open_context *ctx = NULL;
4356         int status;
4357
4358         if (pnfs_ld_layoutret_on_setattr(inode) &&
4359             sattr->ia_valid & ATTR_SIZE &&
4360             sattr->ia_size < i_size_read(inode))
4361                 pnfs_commit_and_return_layout(inode);
4362
4363         nfs_fattr_init(fattr);
4364
4365         /* Deal with open(O_TRUNC) */
4366         if (sattr->ia_valid & ATTR_OPEN)
4367                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4368
4369         /* Optimization: if the end result is no change, don't RPC */
4370         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4371                 return 0;
4372
4373         /* Search for an existing open(O_WRITE) file */
4374         if (sattr->ia_valid & ATTR_FILE) {
4375
4376                 ctx = nfs_file_open_context(sattr->ia_file);
4377                 if (ctx)
4378                         cred = ctx->cred;
4379         }
4380
4381         /* Return any delegations if we're going to change ACLs */
4382         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4383                 nfs4_inode_make_writeable(inode);
4384
4385         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4386         if (status == 0) {
4387                 nfs_setattr_update_inode(inode, sattr, fattr);
4388                 nfs_setsecurity(inode, fattr);
4389         }
4390         return status;
4391 }
4392
4393 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4394                 struct dentry *dentry, struct nfs_fh *fhandle,
4395                 struct nfs_fattr *fattr)
4396 {
4397         struct nfs_server *server = NFS_SERVER(dir);
4398         int                    status;
4399         struct nfs4_lookup_arg args = {
4400                 .bitmask = server->attr_bitmask,
4401                 .dir_fh = NFS_FH(dir),
4402                 .name = &dentry->d_name,
4403         };
4404         struct nfs4_lookup_res res = {
4405                 .server = server,
4406                 .fattr = fattr,
4407                 .fh = fhandle,
4408         };
4409         struct rpc_message msg = {
4410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4411                 .rpc_argp = &args,
4412                 .rpc_resp = &res,
4413         };
4414         unsigned short task_flags = 0;
4415
4416         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4417                 task_flags = RPC_TASK_MOVEABLE;
4418
4419         /* Is this is an attribute revalidation, subject to softreval? */
4420         if (nfs_lookup_is_soft_revalidate(dentry))
4421                 task_flags |= RPC_TASK_TIMEOUT;
4422
4423         args.bitmask = nfs4_bitmask(server, fattr->label);
4424
4425         nfs_fattr_init(fattr);
4426
4427         dprintk("NFS call  lookup %pd2\n", dentry);
4428         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4429         status = nfs4_do_call_sync(clnt, server, &msg,
4430                         &args.seq_args, &res.seq_res, task_flags);
4431         dprintk("NFS reply lookup: %d\n", status);
4432         return status;
4433 }
4434
4435 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4436 {
4437         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4438                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4439         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4440         fattr->nlink = 2;
4441 }
4442
4443 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4444                                    struct dentry *dentry, struct nfs_fh *fhandle,
4445                                    struct nfs_fattr *fattr)
4446 {
4447         struct nfs4_exception exception = {
4448                 .interruptible = true,
4449         };
4450         struct rpc_clnt *client = *clnt;
4451         const struct qstr *name = &dentry->d_name;
4452         int err;
4453         do {
4454                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4455                 trace_nfs4_lookup(dir, name, err);
4456                 switch (err) {
4457                 case -NFS4ERR_BADNAME:
4458                         err = -ENOENT;
4459                         goto out;
4460                 case -NFS4ERR_MOVED:
4461                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4462                         if (err == -NFS4ERR_MOVED)
4463                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4464                         goto out;
4465                 case -NFS4ERR_WRONGSEC:
4466                         err = -EPERM;
4467                         if (client != *clnt)
4468                                 goto out;
4469                         client = nfs4_negotiate_security(client, dir, name);
4470                         if (IS_ERR(client))
4471                                 return PTR_ERR(client);
4472
4473                         exception.retry = 1;
4474                         break;
4475                 default:
4476                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4477                 }
4478         } while (exception.retry);
4479
4480 out:
4481         if (err == 0)
4482                 *clnt = client;
4483         else if (client != *clnt)
4484                 rpc_shutdown_client(client);
4485
4486         return err;
4487 }
4488
4489 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4490                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4491 {
4492         int status;
4493         struct rpc_clnt *client = NFS_CLIENT(dir);
4494
4495         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4496         if (client != NFS_CLIENT(dir)) {
4497                 rpc_shutdown_client(client);
4498                 nfs_fixup_secinfo_attributes(fattr);
4499         }
4500         return status;
4501 }
4502
4503 struct rpc_clnt *
4504 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4505                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4506 {
4507         struct rpc_clnt *client = NFS_CLIENT(dir);
4508         int status;
4509
4510         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4511         if (status < 0)
4512                 return ERR_PTR(status);
4513         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4514 }
4515
4516 static int _nfs4_proc_lookupp(struct inode *inode,
4517                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4518 {
4519         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4520         struct nfs_server *server = NFS_SERVER(inode);
4521         int                    status;
4522         struct nfs4_lookupp_arg args = {
4523                 .bitmask = server->attr_bitmask,
4524                 .fh = NFS_FH(inode),
4525         };
4526         struct nfs4_lookupp_res res = {
4527                 .server = server,
4528                 .fattr = fattr,
4529                 .fh = fhandle,
4530         };
4531         struct rpc_message msg = {
4532                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4533                 .rpc_argp = &args,
4534                 .rpc_resp = &res,
4535         };
4536         unsigned short task_flags = 0;
4537
4538         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4539                 task_flags |= RPC_TASK_TIMEOUT;
4540
4541         args.bitmask = nfs4_bitmask(server, fattr->label);
4542
4543         nfs_fattr_init(fattr);
4544
4545         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4546         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4547                                 &res.seq_res, task_flags);
4548         dprintk("NFS reply lookupp: %d\n", status);
4549         return status;
4550 }
4551
4552 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4553                              struct nfs_fattr *fattr)
4554 {
4555         struct nfs4_exception exception = {
4556                 .interruptible = true,
4557         };
4558         int err;
4559         do {
4560                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4561                 trace_nfs4_lookupp(inode, err);
4562                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4563                                 &exception);
4564         } while (exception.retry);
4565         return err;
4566 }
4567
4568 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4569                              const struct cred *cred)
4570 {
4571         struct nfs_server *server = NFS_SERVER(inode);
4572         struct nfs4_accessargs args = {
4573                 .fh = NFS_FH(inode),
4574                 .access = entry->mask,
4575         };
4576         struct nfs4_accessres res = {
4577                 .server = server,
4578         };
4579         struct rpc_message msg = {
4580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4581                 .rpc_argp = &args,
4582                 .rpc_resp = &res,
4583                 .rpc_cred = cred,
4584         };
4585         int status = 0;
4586
4587         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4588                 res.fattr = nfs_alloc_fattr();
4589                 if (res.fattr == NULL)
4590                         return -ENOMEM;
4591                 args.bitmask = server->cache_consistency_bitmask;
4592         }
4593         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4594         if (!status) {
4595                 nfs_access_set_mask(entry, res.access);
4596                 if (res.fattr)
4597                         nfs_refresh_inode(inode, res.fattr);
4598         }
4599         nfs_free_fattr(res.fattr);
4600         return status;
4601 }
4602
4603 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4604                             const struct cred *cred)
4605 {
4606         struct nfs4_exception exception = {
4607                 .interruptible = true,
4608         };
4609         int err;
4610         do {
4611                 err = _nfs4_proc_access(inode, entry, cred);
4612                 trace_nfs4_access(inode, err);
4613                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4614                                 &exception);
4615         } while (exception.retry);
4616         return err;
4617 }
4618
4619 /*
4620  * TODO: For the time being, we don't try to get any attributes
4621  * along with any of the zero-copy operations READ, READDIR,
4622  * READLINK, WRITE.
4623  *
4624  * In the case of the first three, we want to put the GETATTR
4625  * after the read-type operation -- this is because it is hard
4626  * to predict the length of a GETATTR response in v4, and thus
4627  * align the READ data correctly.  This means that the GETATTR
4628  * may end up partially falling into the page cache, and we should
4629  * shift it into the 'tail' of the xdr_buf before processing.
4630  * To do this efficiently, we need to know the total length
4631  * of data received, which doesn't seem to be available outside
4632  * of the RPC layer.
4633  *
4634  * In the case of WRITE, we also want to put the GETATTR after
4635  * the operation -- in this case because we want to make sure
4636  * we get the post-operation mtime and size.
4637  *
4638  * Both of these changes to the XDR layer would in fact be quite
4639  * minor, but I decided to leave them for a subsequent patch.
4640  */
4641 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4642                 unsigned int pgbase, unsigned int pglen)
4643 {
4644         struct nfs4_readlink args = {
4645                 .fh       = NFS_FH(inode),
4646                 .pgbase   = pgbase,
4647                 .pglen    = pglen,
4648                 .pages    = &page,
4649         };
4650         struct nfs4_readlink_res res;
4651         struct rpc_message msg = {
4652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4653                 .rpc_argp = &args,
4654                 .rpc_resp = &res,
4655         };
4656
4657         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4658 }
4659
4660 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4661                 unsigned int pgbase, unsigned int pglen)
4662 {
4663         struct nfs4_exception exception = {
4664                 .interruptible = true,
4665         };
4666         int err;
4667         do {
4668                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4669                 trace_nfs4_readlink(inode, err);
4670                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4671                                 &exception);
4672         } while (exception.retry);
4673         return err;
4674 }
4675
4676 /*
4677  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4678  */
4679 static int
4680 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4681                  int flags)
4682 {
4683         struct nfs_server *server = NFS_SERVER(dir);
4684         struct nfs4_label l, *ilabel = NULL;
4685         struct nfs_open_context *ctx;
4686         struct nfs4_state *state;
4687         int status = 0;
4688
4689         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4690         if (IS_ERR(ctx))
4691                 return PTR_ERR(ctx);
4692
4693         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4694
4695         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4696                 sattr->ia_mode &= ~current_umask();
4697         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4698         if (IS_ERR(state)) {
4699                 status = PTR_ERR(state);
4700                 goto out;
4701         }
4702 out:
4703         nfs4_label_release_security(ilabel);
4704         put_nfs_open_context(ctx);
4705         return status;
4706 }
4707
4708 static int
4709 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4710 {
4711         struct nfs_server *server = NFS_SERVER(dir);
4712         struct nfs_removeargs args = {
4713                 .fh = NFS_FH(dir),
4714                 .name = *name,
4715         };
4716         struct nfs_removeres res = {
4717                 .server = server,
4718         };
4719         struct rpc_message msg = {
4720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4721                 .rpc_argp = &args,
4722                 .rpc_resp = &res,
4723         };
4724         unsigned long timestamp = jiffies;
4725         int status;
4726
4727         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4728         if (status == 0) {
4729                 spin_lock(&dir->i_lock);
4730                 /* Removing a directory decrements nlink in the parent */
4731                 if (ftype == NF4DIR && dir->i_nlink > 2)
4732                         nfs4_dec_nlink_locked(dir);
4733                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4734                                               NFS_INO_INVALID_DATA);
4735                 spin_unlock(&dir->i_lock);
4736         }
4737         return status;
4738 }
4739
4740 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4741 {
4742         struct nfs4_exception exception = {
4743                 .interruptible = true,
4744         };
4745         struct inode *inode = d_inode(dentry);
4746         int err;
4747
4748         if (inode) {
4749                 if (inode->i_nlink == 1)
4750                         nfs4_inode_return_delegation(inode);
4751                 else
4752                         nfs4_inode_make_writeable(inode);
4753         }
4754         do {
4755                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4756                 trace_nfs4_remove(dir, &dentry->d_name, err);
4757                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4758                                 &exception);
4759         } while (exception.retry);
4760         return err;
4761 }
4762
4763 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4764 {
4765         struct nfs4_exception exception = {
4766                 .interruptible = true,
4767         };
4768         int err;
4769
4770         do {
4771                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4772                 trace_nfs4_remove(dir, name, err);
4773                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4774                                 &exception);
4775         } while (exception.retry);
4776         return err;
4777 }
4778
4779 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4780                 struct dentry *dentry,
4781                 struct inode *inode)
4782 {
4783         struct nfs_removeargs *args = msg->rpc_argp;
4784         struct nfs_removeres *res = msg->rpc_resp;
4785
4786         res->server = NFS_SB(dentry->d_sb);
4787         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4788         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4789
4790         nfs_fattr_init(res->dir_attr);
4791
4792         if (inode) {
4793                 nfs4_inode_return_delegation(inode);
4794                 nfs_d_prune_case_insensitive_aliases(inode);
4795         }
4796 }
4797
4798 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4799 {
4800         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4801                         &data->args.seq_args,
4802                         &data->res.seq_res,
4803                         task);
4804 }
4805
4806 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4807 {
4808         struct nfs_unlinkdata *data = task->tk_calldata;
4809         struct nfs_removeres *res = &data->res;
4810
4811         if (!nfs4_sequence_done(task, &res->seq_res))
4812                 return 0;
4813         if (nfs4_async_handle_error(task, res->server, NULL,
4814                                     &data->timeout) == -EAGAIN)
4815                 return 0;
4816         if (task->tk_status == 0)
4817                 nfs4_update_changeattr(dir, &res->cinfo,
4818                                 res->dir_attr->time_start,
4819                                 NFS_INO_INVALID_DATA);
4820         return 1;
4821 }
4822
4823 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4824                 struct dentry *old_dentry,
4825                 struct dentry *new_dentry)
4826 {
4827         struct nfs_renameargs *arg = msg->rpc_argp;
4828         struct nfs_renameres *res = msg->rpc_resp;
4829         struct inode *old_inode = d_inode(old_dentry);
4830         struct inode *new_inode = d_inode(new_dentry);
4831
4832         if (old_inode)
4833                 nfs4_inode_make_writeable(old_inode);
4834         if (new_inode)
4835                 nfs4_inode_return_delegation(new_inode);
4836         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4837         res->server = NFS_SB(old_dentry->d_sb);
4838         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4839 }
4840
4841 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4842 {
4843         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4844                         &data->args.seq_args,
4845                         &data->res.seq_res,
4846                         task);
4847 }
4848
4849 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4850                                  struct inode *new_dir)
4851 {
4852         struct nfs_renamedata *data = task->tk_calldata;
4853         struct nfs_renameres *res = &data->res;
4854
4855         if (!nfs4_sequence_done(task, &res->seq_res))
4856                 return 0;
4857         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4858                 return 0;
4859
4860         if (task->tk_status == 0) {
4861                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4862                 if (new_dir != old_dir) {
4863                         /* Note: If we moved a directory, nlink will change */
4864                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4865                                         res->old_fattr->time_start,
4866                                         NFS_INO_INVALID_NLINK |
4867                                             NFS_INO_INVALID_DATA);
4868                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4869                                         res->new_fattr->time_start,
4870                                         NFS_INO_INVALID_NLINK |
4871                                             NFS_INO_INVALID_DATA);
4872                 } else
4873                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4874                                         res->old_fattr->time_start,
4875                                         NFS_INO_INVALID_DATA);
4876         }
4877         return 1;
4878 }
4879
4880 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4881 {
4882         struct nfs_server *server = NFS_SERVER(inode);
4883         __u32 bitmask[NFS4_BITMASK_SZ];
4884         struct nfs4_link_arg arg = {
4885                 .fh     = NFS_FH(inode),
4886                 .dir_fh = NFS_FH(dir),
4887                 .name   = name,
4888                 .bitmask = bitmask,
4889         };
4890         struct nfs4_link_res res = {
4891                 .server = server,
4892         };
4893         struct rpc_message msg = {
4894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4895                 .rpc_argp = &arg,
4896                 .rpc_resp = &res,
4897         };
4898         int status = -ENOMEM;
4899
4900         res.fattr = nfs_alloc_fattr_with_label(server);
4901         if (res.fattr == NULL)
4902                 goto out;
4903
4904         nfs4_inode_make_writeable(inode);
4905         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4906                                 NFS_INO_INVALID_CHANGE);
4907         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4908         if (!status) {
4909                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4910                                        NFS_INO_INVALID_DATA);
4911                 nfs4_inc_nlink(inode);
4912                 status = nfs_post_op_update_inode(inode, res.fattr);
4913                 if (!status)
4914                         nfs_setsecurity(inode, res.fattr);
4915         }
4916
4917 out:
4918         nfs_free_fattr(res.fattr);
4919         return status;
4920 }
4921
4922 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4923 {
4924         struct nfs4_exception exception = {
4925                 .interruptible = true,
4926         };
4927         int err;
4928         do {
4929                 err = nfs4_handle_exception(NFS_SERVER(inode),
4930                                 _nfs4_proc_link(inode, dir, name),
4931                                 &exception);
4932         } while (exception.retry);
4933         return err;
4934 }
4935
4936 struct nfs4_createdata {
4937         struct rpc_message msg;
4938         struct nfs4_create_arg arg;
4939         struct nfs4_create_res res;
4940         struct nfs_fh fh;
4941         struct nfs_fattr fattr;
4942 };
4943
4944 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4945                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4946 {
4947         struct nfs4_createdata *data;
4948
4949         data = kzalloc(sizeof(*data), GFP_KERNEL);
4950         if (data != NULL) {
4951                 struct nfs_server *server = NFS_SERVER(dir);
4952
4953                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4954                 if (IS_ERR(data->fattr.label))
4955                         goto out_free;
4956
4957                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4958                 data->msg.rpc_argp = &data->arg;
4959                 data->msg.rpc_resp = &data->res;
4960                 data->arg.dir_fh = NFS_FH(dir);
4961                 data->arg.server = server;
4962                 data->arg.name = name;
4963                 data->arg.attrs = sattr;
4964                 data->arg.ftype = ftype;
4965                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4966                 data->arg.umask = current_umask();
4967                 data->res.server = server;
4968                 data->res.fh = &data->fh;
4969                 data->res.fattr = &data->fattr;
4970                 nfs_fattr_init(data->res.fattr);
4971         }
4972         return data;
4973 out_free:
4974         kfree(data);
4975         return NULL;
4976 }
4977
4978 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4979 {
4980         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4981                                     &data->arg.seq_args, &data->res.seq_res, 1);
4982         if (status == 0) {
4983                 spin_lock(&dir->i_lock);
4984                 /* Creating a directory bumps nlink in the parent */
4985                 if (data->arg.ftype == NF4DIR)
4986                         nfs4_inc_nlink_locked(dir);
4987                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4988                                               data->res.fattr->time_start,
4989                                               NFS_INO_INVALID_DATA);
4990                 spin_unlock(&dir->i_lock);
4991                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
4992         }
4993         return status;
4994 }
4995
4996 static void nfs4_free_createdata(struct nfs4_createdata *data)
4997 {
4998         nfs4_label_free(data->fattr.label);
4999         kfree(data);
5000 }
5001
5002 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5003                 struct page *page, unsigned int len, struct iattr *sattr,
5004                 struct nfs4_label *label)
5005 {
5006         struct nfs4_createdata *data;
5007         int status = -ENAMETOOLONG;
5008
5009         if (len > NFS4_MAXPATHLEN)
5010                 goto out;
5011
5012         status = -ENOMEM;
5013         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5014         if (data == NULL)
5015                 goto out;
5016
5017         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5018         data->arg.u.symlink.pages = &page;
5019         data->arg.u.symlink.len = len;
5020         data->arg.label = label;
5021
5022         status = nfs4_do_create(dir, dentry, data);
5023
5024         nfs4_free_createdata(data);
5025 out:
5026         return status;
5027 }
5028
5029 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5030                 struct page *page, unsigned int len, struct iattr *sattr)
5031 {
5032         struct nfs4_exception exception = {
5033                 .interruptible = true,
5034         };
5035         struct nfs4_label l, *label = NULL;
5036         int err;
5037
5038         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5039
5040         do {
5041                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5042                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5043                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5044                                 &exception);
5045         } while (exception.retry);
5046
5047         nfs4_label_release_security(label);
5048         return err;
5049 }
5050
5051 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5052                 struct iattr *sattr, struct nfs4_label *label)
5053 {
5054         struct nfs4_createdata *data;
5055         int status = -ENOMEM;
5056
5057         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5058         if (data == NULL)
5059                 goto out;
5060
5061         data->arg.label = label;
5062         status = nfs4_do_create(dir, dentry, data);
5063
5064         nfs4_free_createdata(data);
5065 out:
5066         return status;
5067 }
5068
5069 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5070                 struct iattr *sattr)
5071 {
5072         struct nfs_server *server = NFS_SERVER(dir);
5073         struct nfs4_exception exception = {
5074                 .interruptible = true,
5075         };
5076         struct nfs4_label l, *label = NULL;
5077         int err;
5078
5079         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5080
5081         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5082                 sattr->ia_mode &= ~current_umask();
5083         do {
5084                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5085                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5086                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5087                                 &exception);
5088         } while (exception.retry);
5089         nfs4_label_release_security(label);
5090
5091         return err;
5092 }
5093
5094 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5095                               struct nfs_readdir_res *nr_res)
5096 {
5097         struct inode            *dir = d_inode(nr_arg->dentry);
5098         struct nfs_server       *server = NFS_SERVER(dir);
5099         struct nfs4_readdir_arg args = {
5100                 .fh = NFS_FH(dir),
5101                 .pages = nr_arg->pages,
5102                 .pgbase = 0,
5103                 .count = nr_arg->page_len,
5104                 .plus = nr_arg->plus,
5105         };
5106         struct nfs4_readdir_res res;
5107         struct rpc_message msg = {
5108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5109                 .rpc_argp = &args,
5110                 .rpc_resp = &res,
5111                 .rpc_cred = nr_arg->cred,
5112         };
5113         int                     status;
5114
5115         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5116                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5117         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5118                 args.bitmask = server->attr_bitmask_nl;
5119         else
5120                 args.bitmask = server->attr_bitmask;
5121
5122         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5123         res.pgbase = args.pgbase;
5124         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5125                         &res.seq_res, 0);
5126         if (status >= 0) {
5127                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5128                 status += args.pgbase;
5129         }
5130
5131         nfs_invalidate_atime(dir);
5132
5133         dprintk("%s: returns %d\n", __func__, status);
5134         return status;
5135 }
5136
5137 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5138                              struct nfs_readdir_res *res)
5139 {
5140         struct nfs4_exception exception = {
5141                 .interruptible = true,
5142         };
5143         int err;
5144         do {
5145                 err = _nfs4_proc_readdir(arg, res);
5146                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5147                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5148                                             err, &exception);
5149         } while (exception.retry);
5150         return err;
5151 }
5152
5153 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5154                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5155 {
5156         struct nfs4_createdata *data;
5157         int mode = sattr->ia_mode;
5158         int status = -ENOMEM;
5159
5160         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5161         if (data == NULL)
5162                 goto out;
5163
5164         if (S_ISFIFO(mode))
5165                 data->arg.ftype = NF4FIFO;
5166         else if (S_ISBLK(mode)) {
5167                 data->arg.ftype = NF4BLK;
5168                 data->arg.u.device.specdata1 = MAJOR(rdev);
5169                 data->arg.u.device.specdata2 = MINOR(rdev);
5170         }
5171         else if (S_ISCHR(mode)) {
5172                 data->arg.ftype = NF4CHR;
5173                 data->arg.u.device.specdata1 = MAJOR(rdev);
5174                 data->arg.u.device.specdata2 = MINOR(rdev);
5175         } else if (!S_ISSOCK(mode)) {
5176                 status = -EINVAL;
5177                 goto out_free;
5178         }
5179
5180         data->arg.label = label;
5181         status = nfs4_do_create(dir, dentry, data);
5182 out_free:
5183         nfs4_free_createdata(data);
5184 out:
5185         return status;
5186 }
5187
5188 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5189                 struct iattr *sattr, dev_t rdev)
5190 {
5191         struct nfs_server *server = NFS_SERVER(dir);
5192         struct nfs4_exception exception = {
5193                 .interruptible = true,
5194         };
5195         struct nfs4_label l, *label = NULL;
5196         int err;
5197
5198         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5199
5200         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5201                 sattr->ia_mode &= ~current_umask();
5202         do {
5203                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5204                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5205                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5206                                 &exception);
5207         } while (exception.retry);
5208
5209         nfs4_label_release_security(label);
5210
5211         return err;
5212 }
5213
5214 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5215                  struct nfs_fsstat *fsstat)
5216 {
5217         struct nfs4_statfs_arg args = {
5218                 .fh = fhandle,
5219                 .bitmask = server->attr_bitmask,
5220         };
5221         struct nfs4_statfs_res res = {
5222                 .fsstat = fsstat,
5223         };
5224         struct rpc_message msg = {
5225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5226                 .rpc_argp = &args,
5227                 .rpc_resp = &res,
5228         };
5229
5230         nfs_fattr_init(fsstat->fattr);
5231         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5232 }
5233
5234 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5235 {
5236         struct nfs4_exception exception = {
5237                 .interruptible = true,
5238         };
5239         int err;
5240         do {
5241                 err = nfs4_handle_exception(server,
5242                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5243                                 &exception);
5244         } while (exception.retry);
5245         return err;
5246 }
5247
5248 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5249                 struct nfs_fsinfo *fsinfo)
5250 {
5251         struct nfs4_fsinfo_arg args = {
5252                 .fh = fhandle,
5253                 .bitmask = server->attr_bitmask,
5254         };
5255         struct nfs4_fsinfo_res res = {
5256                 .fsinfo = fsinfo,
5257         };
5258         struct rpc_message msg = {
5259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5260                 .rpc_argp = &args,
5261                 .rpc_resp = &res,
5262         };
5263
5264         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5265 }
5266
5267 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5268 {
5269         struct nfs4_exception exception = {
5270                 .interruptible = true,
5271         };
5272         int err;
5273
5274         do {
5275                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5276                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5277                 if (err == 0) {
5278                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5279                         break;
5280                 }
5281                 err = nfs4_handle_exception(server, err, &exception);
5282         } while (exception.retry);
5283         return err;
5284 }
5285
5286 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5287 {
5288         int error;
5289
5290         nfs_fattr_init(fsinfo->fattr);
5291         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5292         if (error == 0) {
5293                 /* block layout checks this! */
5294                 server->pnfs_blksize = fsinfo->blksize;
5295                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5296         }
5297
5298         return error;
5299 }
5300
5301 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5302                 struct nfs_pathconf *pathconf)
5303 {
5304         struct nfs4_pathconf_arg args = {
5305                 .fh = fhandle,
5306                 .bitmask = server->attr_bitmask,
5307         };
5308         struct nfs4_pathconf_res res = {
5309                 .pathconf = pathconf,
5310         };
5311         struct rpc_message msg = {
5312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5313                 .rpc_argp = &args,
5314                 .rpc_resp = &res,
5315         };
5316
5317         /* None of the pathconf attributes are mandatory to implement */
5318         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5319                 memset(pathconf, 0, sizeof(*pathconf));
5320                 return 0;
5321         }
5322
5323         nfs_fattr_init(pathconf->fattr);
5324         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5325 }
5326
5327 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5328                 struct nfs_pathconf *pathconf)
5329 {
5330         struct nfs4_exception exception = {
5331                 .interruptible = true,
5332         };
5333         int err;
5334
5335         do {
5336                 err = nfs4_handle_exception(server,
5337                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5338                                 &exception);
5339         } while (exception.retry);
5340         return err;
5341 }
5342
5343 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5344                 const struct nfs_open_context *ctx,
5345                 const struct nfs_lock_context *l_ctx,
5346                 fmode_t fmode)
5347 {
5348         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5349 }
5350 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5351
5352 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5353                 const struct nfs_open_context *ctx,
5354                 const struct nfs_lock_context *l_ctx,
5355                 fmode_t fmode)
5356 {
5357         nfs4_stateid _current_stateid;
5358
5359         /* If the current stateid represents a lost lock, then exit */
5360         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5361                 return true;
5362         return nfs4_stateid_match(stateid, &_current_stateid);
5363 }
5364
5365 static bool nfs4_error_stateid_expired(int err)
5366 {
5367         switch (err) {
5368         case -NFS4ERR_DELEG_REVOKED:
5369         case -NFS4ERR_ADMIN_REVOKED:
5370         case -NFS4ERR_BAD_STATEID:
5371         case -NFS4ERR_STALE_STATEID:
5372         case -NFS4ERR_OLD_STATEID:
5373         case -NFS4ERR_OPENMODE:
5374         case -NFS4ERR_EXPIRED:
5375                 return true;
5376         }
5377         return false;
5378 }
5379
5380 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5381 {
5382         struct nfs_server *server = NFS_SERVER(hdr->inode);
5383
5384         trace_nfs4_read(hdr, task->tk_status);
5385         if (task->tk_status < 0) {
5386                 struct nfs4_exception exception = {
5387                         .inode = hdr->inode,
5388                         .state = hdr->args.context->state,
5389                         .stateid = &hdr->args.stateid,
5390                 };
5391                 task->tk_status = nfs4_async_handle_exception(task,
5392                                 server, task->tk_status, &exception);
5393                 if (exception.retry) {
5394                         rpc_restart_call_prepare(task);
5395                         return -EAGAIN;
5396                 }
5397         }
5398
5399         if (task->tk_status > 0)
5400                 renew_lease(server, hdr->timestamp);
5401         return 0;
5402 }
5403
5404 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5405                 struct nfs_pgio_args *args)
5406 {
5407
5408         if (!nfs4_error_stateid_expired(task->tk_status) ||
5409                 nfs4_stateid_is_current(&args->stateid,
5410                                 args->context,
5411                                 args->lock_context,
5412                                 FMODE_READ))
5413                 return false;
5414         rpc_restart_call_prepare(task);
5415         return true;
5416 }
5417
5418 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5419                                          struct nfs_pgio_header *hdr)
5420 {
5421         struct nfs_server *server = NFS_SERVER(hdr->inode);
5422         struct rpc_message *msg = &task->tk_msg;
5423
5424         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5425             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5426                 server->caps &= ~NFS_CAP_READ_PLUS;
5427                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5428                 rpc_restart_call_prepare(task);
5429                 return true;
5430         }
5431         return false;
5432 }
5433
5434 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5435 {
5436         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5437                 return -EAGAIN;
5438         if (nfs4_read_stateid_changed(task, &hdr->args))
5439                 return -EAGAIN;
5440         if (nfs4_read_plus_not_supported(task, hdr))
5441                 return -EAGAIN;
5442         if (task->tk_status > 0)
5443                 nfs_invalidate_atime(hdr->inode);
5444         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5445                                     nfs4_read_done_cb(task, hdr);
5446 }
5447
5448 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5449 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5450                                     struct rpc_message *msg)
5451 {
5452         /* Note: We don't use READ_PLUS with pNFS yet */
5453         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5454                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5455 }
5456 #else
5457 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5458                                     struct rpc_message *msg)
5459 {
5460 }
5461 #endif /* CONFIG_NFS_V4_2 */
5462
5463 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5464                                  struct rpc_message *msg)
5465 {
5466         hdr->timestamp   = jiffies;
5467         if (!hdr->pgio_done_cb)
5468                 hdr->pgio_done_cb = nfs4_read_done_cb;
5469         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5470         nfs42_read_plus_support(hdr, msg);
5471         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5472 }
5473
5474 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5475                                       struct nfs_pgio_header *hdr)
5476 {
5477         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5478                         &hdr->args.seq_args,
5479                         &hdr->res.seq_res,
5480                         task))
5481                 return 0;
5482         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5483                                 hdr->args.lock_context,
5484                                 hdr->rw_mode) == -EIO)
5485                 return -EIO;
5486         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5487                 return -EIO;
5488         return 0;
5489 }
5490
5491 static int nfs4_write_done_cb(struct rpc_task *task,
5492                               struct nfs_pgio_header *hdr)
5493 {
5494         struct inode *inode = hdr->inode;
5495
5496         trace_nfs4_write(hdr, task->tk_status);
5497         if (task->tk_status < 0) {
5498                 struct nfs4_exception exception = {
5499                         .inode = hdr->inode,
5500                         .state = hdr->args.context->state,
5501                         .stateid = &hdr->args.stateid,
5502                 };
5503                 task->tk_status = nfs4_async_handle_exception(task,
5504                                 NFS_SERVER(inode), task->tk_status,
5505                                 &exception);
5506                 if (exception.retry) {
5507                         rpc_restart_call_prepare(task);
5508                         return -EAGAIN;
5509                 }
5510         }
5511         if (task->tk_status >= 0) {
5512                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5513                 nfs_writeback_update_inode(hdr);
5514         }
5515         return 0;
5516 }
5517
5518 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5519                 struct nfs_pgio_args *args)
5520 {
5521
5522         if (!nfs4_error_stateid_expired(task->tk_status) ||
5523                 nfs4_stateid_is_current(&args->stateid,
5524                                 args->context,
5525                                 args->lock_context,
5526                                 FMODE_WRITE))
5527                 return false;
5528         rpc_restart_call_prepare(task);
5529         return true;
5530 }
5531
5532 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5533 {
5534         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5535                 return -EAGAIN;
5536         if (nfs4_write_stateid_changed(task, &hdr->args))
5537                 return -EAGAIN;
5538         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5539                 nfs4_write_done_cb(task, hdr);
5540 }
5541
5542 static
5543 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5544 {
5545         /* Don't request attributes for pNFS or O_DIRECT writes */
5546         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5547                 return false;
5548         /* Otherwise, request attributes if and only if we don't hold
5549          * a delegation
5550          */
5551         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5552 }
5553
5554 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5555                       struct inode *inode, unsigned long cache_validity)
5556 {
5557         struct nfs_server *server = NFS_SERVER(inode);
5558         unsigned int i;
5559
5560         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5561         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5562
5563         if (cache_validity & NFS_INO_INVALID_CHANGE)
5564                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5565         if (cache_validity & NFS_INO_INVALID_ATIME)
5566                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5567         if (cache_validity & NFS_INO_INVALID_MODE)
5568                 bitmask[1] |= FATTR4_WORD1_MODE;
5569         if (cache_validity & NFS_INO_INVALID_OTHER)
5570                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5571         if (cache_validity & NFS_INO_INVALID_NLINK)
5572                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5573         if (cache_validity & NFS_INO_INVALID_CTIME)
5574                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5575         if (cache_validity & NFS_INO_INVALID_MTIME)
5576                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5577         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5578                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5579
5580         if (cache_validity & NFS_INO_INVALID_SIZE)
5581                 bitmask[0] |= FATTR4_WORD0_SIZE;
5582
5583         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5584                 bitmask[i] &= server->attr_bitmask[i];
5585 }
5586
5587 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5588                                   struct rpc_message *msg,
5589                                   struct rpc_clnt **clnt)
5590 {
5591         struct nfs_server *server = NFS_SERVER(hdr->inode);
5592
5593         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5594                 hdr->args.bitmask = NULL;
5595                 hdr->res.fattr = NULL;
5596         } else {
5597                 nfs4_bitmask_set(hdr->args.bitmask_store,
5598                                  server->cache_consistency_bitmask,
5599                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5600                 hdr->args.bitmask = hdr->args.bitmask_store;
5601         }
5602
5603         if (!hdr->pgio_done_cb)
5604                 hdr->pgio_done_cb = nfs4_write_done_cb;
5605         hdr->res.server = server;
5606         hdr->timestamp   = jiffies;
5607
5608         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5609         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5610         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5611 }
5612
5613 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5614 {
5615         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5616                         &data->args.seq_args,
5617                         &data->res.seq_res,
5618                         task);
5619 }
5620
5621 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5622 {
5623         struct inode *inode = data->inode;
5624
5625         trace_nfs4_commit(data, task->tk_status);
5626         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5627                                     NULL, NULL) == -EAGAIN) {
5628                 rpc_restart_call_prepare(task);
5629                 return -EAGAIN;
5630         }
5631         return 0;
5632 }
5633
5634 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5635 {
5636         if (!nfs4_sequence_done(task, &data->res.seq_res))
5637                 return -EAGAIN;
5638         return data->commit_done_cb(task, data);
5639 }
5640
5641 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5642                                    struct rpc_clnt **clnt)
5643 {
5644         struct nfs_server *server = NFS_SERVER(data->inode);
5645
5646         if (data->commit_done_cb == NULL)
5647                 data->commit_done_cb = nfs4_commit_done_cb;
5648         data->res.server = server;
5649         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5650         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5651         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5652 }
5653
5654 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5655                                 struct nfs_commitres *res)
5656 {
5657         struct inode *dst_inode = file_inode(dst);
5658         struct nfs_server *server = NFS_SERVER(dst_inode);
5659         struct rpc_message msg = {
5660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5661                 .rpc_argp = args,
5662                 .rpc_resp = res,
5663         };
5664
5665         args->fh = NFS_FH(dst_inode);
5666         return nfs4_call_sync(server->client, server, &msg,
5667                         &args->seq_args, &res->seq_res, 1);
5668 }
5669
5670 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5671 {
5672         struct nfs_commitargs args = {
5673                 .offset = offset,
5674                 .count = count,
5675         };
5676         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5677         struct nfs4_exception exception = { };
5678         int status;
5679
5680         do {
5681                 status = _nfs4_proc_commit(dst, &args, res);
5682                 status = nfs4_handle_exception(dst_server, status, &exception);
5683         } while (exception.retry);
5684
5685         return status;
5686 }
5687
5688 struct nfs4_renewdata {
5689         struct nfs_client       *client;
5690         unsigned long           timestamp;
5691 };
5692
5693 /*
5694  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5695  * standalone procedure for queueing an asynchronous RENEW.
5696  */
5697 static void nfs4_renew_release(void *calldata)
5698 {
5699         struct nfs4_renewdata *data = calldata;
5700         struct nfs_client *clp = data->client;
5701
5702         if (refcount_read(&clp->cl_count) > 1)
5703                 nfs4_schedule_state_renewal(clp);
5704         nfs_put_client(clp);
5705         kfree(data);
5706 }
5707
5708 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5709 {
5710         struct nfs4_renewdata *data = calldata;
5711         struct nfs_client *clp = data->client;
5712         unsigned long timestamp = data->timestamp;
5713
5714         trace_nfs4_renew_async(clp, task->tk_status);
5715         switch (task->tk_status) {
5716         case 0:
5717                 break;
5718         case -NFS4ERR_LEASE_MOVED:
5719                 nfs4_schedule_lease_moved_recovery(clp);
5720                 break;
5721         default:
5722                 /* Unless we're shutting down, schedule state recovery! */
5723                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5724                         return;
5725                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5726                         nfs4_schedule_lease_recovery(clp);
5727                         return;
5728                 }
5729                 nfs4_schedule_path_down_recovery(clp);
5730         }
5731         do_renew_lease(clp, timestamp);
5732 }
5733
5734 static const struct rpc_call_ops nfs4_renew_ops = {
5735         .rpc_call_done = nfs4_renew_done,
5736         .rpc_release = nfs4_renew_release,
5737 };
5738
5739 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5740 {
5741         struct rpc_message msg = {
5742                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5743                 .rpc_argp       = clp,
5744                 .rpc_cred       = cred,
5745         };
5746         struct nfs4_renewdata *data;
5747
5748         if (renew_flags == 0)
5749                 return 0;
5750         if (!refcount_inc_not_zero(&clp->cl_count))
5751                 return -EIO;
5752         data = kmalloc(sizeof(*data), GFP_NOFS);
5753         if (data == NULL) {
5754                 nfs_put_client(clp);
5755                 return -ENOMEM;
5756         }
5757         data->client = clp;
5758         data->timestamp = jiffies;
5759         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5760                         &nfs4_renew_ops, data);
5761 }
5762
5763 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5764 {
5765         struct rpc_message msg = {
5766                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5767                 .rpc_argp       = clp,
5768                 .rpc_cred       = cred,
5769         };
5770         unsigned long now = jiffies;
5771         int status;
5772
5773         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5774         if (status < 0)
5775                 return status;
5776         do_renew_lease(clp, now);
5777         return 0;
5778 }
5779
5780 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5781                                       enum nfs4_acl_type type)
5782 {
5783         switch (type) {
5784         default:
5785                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5786         case NFS4ACL_DACL:
5787                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5788         case NFS4ACL_SACL:
5789                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5790         }
5791 }
5792
5793 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5794  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5795  * the stack.
5796  */
5797 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5798
5799 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5800                 struct page **pages)
5801 {
5802         struct page *newpage, **spages;
5803         int rc = 0;
5804         size_t len;
5805         spages = pages;
5806
5807         do {
5808                 len = min_t(size_t, PAGE_SIZE, buflen);
5809                 newpage = alloc_page(GFP_KERNEL);
5810
5811                 if (newpage == NULL)
5812                         goto unwind;
5813                 memcpy(page_address(newpage), buf, len);
5814                 buf += len;
5815                 buflen -= len;
5816                 *pages++ = newpage;
5817                 rc++;
5818         } while (buflen != 0);
5819
5820         return rc;
5821
5822 unwind:
5823         for(; rc > 0; rc--)
5824                 __free_page(spages[rc-1]);
5825         return -ENOMEM;
5826 }
5827
5828 struct nfs4_cached_acl {
5829         enum nfs4_acl_type type;
5830         int cached;
5831         size_t len;
5832         char data[];
5833 };
5834
5835 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5836 {
5837         struct nfs_inode *nfsi = NFS_I(inode);
5838
5839         spin_lock(&inode->i_lock);
5840         kfree(nfsi->nfs4_acl);
5841         nfsi->nfs4_acl = acl;
5842         spin_unlock(&inode->i_lock);
5843 }
5844
5845 static void nfs4_zap_acl_attr(struct inode *inode)
5846 {
5847         nfs4_set_cached_acl(inode, NULL);
5848 }
5849
5850 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5851                                     size_t buflen, enum nfs4_acl_type type)
5852 {
5853         struct nfs_inode *nfsi = NFS_I(inode);
5854         struct nfs4_cached_acl *acl;
5855         int ret = -ENOENT;
5856
5857         spin_lock(&inode->i_lock);
5858         acl = nfsi->nfs4_acl;
5859         if (acl == NULL)
5860                 goto out;
5861         if (acl->type != type)
5862                 goto out;
5863         if (buf == NULL) /* user is just asking for length */
5864                 goto out_len;
5865         if (acl->cached == 0)
5866                 goto out;
5867         ret = -ERANGE; /* see getxattr(2) man page */
5868         if (acl->len > buflen)
5869                 goto out;
5870         memcpy(buf, acl->data, acl->len);
5871 out_len:
5872         ret = acl->len;
5873 out:
5874         spin_unlock(&inode->i_lock);
5875         return ret;
5876 }
5877
5878 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5879                                   size_t pgbase, size_t acl_len,
5880                                   enum nfs4_acl_type type)
5881 {
5882         struct nfs4_cached_acl *acl;
5883         size_t buflen = sizeof(*acl) + acl_len;
5884
5885         if (buflen <= PAGE_SIZE) {
5886                 acl = kmalloc(buflen, GFP_KERNEL);
5887                 if (acl == NULL)
5888                         goto out;
5889                 acl->cached = 1;
5890                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5891         } else {
5892                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5893                 if (acl == NULL)
5894                         goto out;
5895                 acl->cached = 0;
5896         }
5897         acl->type = type;
5898         acl->len = acl_len;
5899 out:
5900         nfs4_set_cached_acl(inode, acl);
5901 }
5902
5903 /*
5904  * The getxattr API returns the required buffer length when called with a
5905  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5906  * the required buf.  On a NULL buf, we send a page of data to the server
5907  * guessing that the ACL request can be serviced by a page. If so, we cache
5908  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5909  * the cache. If not so, we throw away the page, and cache the required
5910  * length. The next getxattr call will then produce another round trip to
5911  * the server, this time with the input buf of the required size.
5912  */
5913 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5914                                        size_t buflen, enum nfs4_acl_type type)
5915 {
5916         struct page **pages;
5917         struct nfs_getaclargs args = {
5918                 .fh = NFS_FH(inode),
5919                 .acl_type = type,
5920                 .acl_len = buflen,
5921         };
5922         struct nfs_getaclres res = {
5923                 .acl_type = type,
5924                 .acl_len = buflen,
5925         };
5926         struct rpc_message msg = {
5927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5928                 .rpc_argp = &args,
5929                 .rpc_resp = &res,
5930         };
5931         unsigned int npages;
5932         int ret = -ENOMEM, i;
5933         struct nfs_server *server = NFS_SERVER(inode);
5934
5935         if (buflen == 0)
5936                 buflen = server->rsize;
5937
5938         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5939         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5940         if (!pages)
5941                 return -ENOMEM;
5942
5943         args.acl_pages = pages;
5944
5945         for (i = 0; i < npages; i++) {
5946                 pages[i] = alloc_page(GFP_KERNEL);
5947                 if (!pages[i])
5948                         goto out_free;
5949         }
5950
5951         /* for decoding across pages */
5952         res.acl_scratch = alloc_page(GFP_KERNEL);
5953         if (!res.acl_scratch)
5954                 goto out_free;
5955
5956         args.acl_len = npages * PAGE_SIZE;
5957
5958         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5959                 __func__, buf, buflen, npages, args.acl_len);
5960         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5961                              &msg, &args.seq_args, &res.seq_res, 0);
5962         if (ret)
5963                 goto out_free;
5964
5965         /* Handle the case where the passed-in buffer is too short */
5966         if (res.acl_flags & NFS4_ACL_TRUNC) {
5967                 /* Did the user only issue a request for the acl length? */
5968                 if (buf == NULL)
5969                         goto out_ok;
5970                 ret = -ERANGE;
5971                 goto out_free;
5972         }
5973         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5974                               type);
5975         if (buf) {
5976                 if (res.acl_len > buflen) {
5977                         ret = -ERANGE;
5978                         goto out_free;
5979                 }
5980                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5981         }
5982 out_ok:
5983         ret = res.acl_len;
5984 out_free:
5985         for (i = 0; i < npages; i++)
5986                 if (pages[i])
5987                         __free_page(pages[i]);
5988         if (res.acl_scratch)
5989                 __free_page(res.acl_scratch);
5990         kfree(pages);
5991         return ret;
5992 }
5993
5994 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
5995                                      size_t buflen, enum nfs4_acl_type type)
5996 {
5997         struct nfs4_exception exception = {
5998                 .interruptible = true,
5999         };
6000         ssize_t ret;
6001         do {
6002                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6003                 trace_nfs4_get_acl(inode, ret);
6004                 if (ret >= 0)
6005                         break;
6006                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6007         } while (exception.retry);
6008         return ret;
6009 }
6010
6011 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6012                                  enum nfs4_acl_type type)
6013 {
6014         struct nfs_server *server = NFS_SERVER(inode);
6015         int ret;
6016
6017         if (!nfs4_server_supports_acls(server, type))
6018                 return -EOPNOTSUPP;
6019         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6020         if (ret < 0)
6021                 return ret;
6022         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6023                 nfs_zap_acl_cache(inode);
6024         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6025         if (ret != -ENOENT)
6026                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6027                  * but no cached acl data, just the acl length */
6028                 return ret;
6029         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6030 }
6031
6032 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6033                                size_t buflen, enum nfs4_acl_type type)
6034 {
6035         struct nfs_server *server = NFS_SERVER(inode);
6036         struct page *pages[NFS4ACL_MAXPAGES];
6037         struct nfs_setaclargs arg = {
6038                 .fh = NFS_FH(inode),
6039                 .acl_type = type,
6040                 .acl_len = buflen,
6041                 .acl_pages = pages,
6042         };
6043         struct nfs_setaclres res;
6044         struct rpc_message msg = {
6045                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6046                 .rpc_argp       = &arg,
6047                 .rpc_resp       = &res,
6048         };
6049         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6050         int ret, i;
6051
6052         /* You can't remove system.nfs4_acl: */
6053         if (buflen == 0)
6054                 return -EINVAL;
6055         if (!nfs4_server_supports_acls(server, type))
6056                 return -EOPNOTSUPP;
6057         if (npages > ARRAY_SIZE(pages))
6058                 return -ERANGE;
6059         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6060         if (i < 0)
6061                 return i;
6062         nfs4_inode_make_writeable(inode);
6063         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6064
6065         /*
6066          * Free each page after tx, so the only ref left is
6067          * held by the network stack
6068          */
6069         for (; i > 0; i--)
6070                 put_page(pages[i-1]);
6071
6072         /*
6073          * Acl update can result in inode attribute update.
6074          * so mark the attribute cache invalid.
6075          */
6076         spin_lock(&inode->i_lock);
6077         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6078                                              NFS_INO_INVALID_CTIME |
6079                                              NFS_INO_REVAL_FORCED);
6080         spin_unlock(&inode->i_lock);
6081         nfs_access_zap_cache(inode);
6082         nfs_zap_acl_cache(inode);
6083         return ret;
6084 }
6085
6086 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6087                              size_t buflen, enum nfs4_acl_type type)
6088 {
6089         struct nfs4_exception exception = { };
6090         int err;
6091         do {
6092                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6093                 trace_nfs4_set_acl(inode, err);
6094                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6095                         /*
6096                          * no need to retry since the kernel
6097                          * isn't involved in encoding the ACEs.
6098                          */
6099                         err = -EINVAL;
6100                         break;
6101                 }
6102                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6103                                 &exception);
6104         } while (exception.retry);
6105         return err;
6106 }
6107
6108 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6109 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6110                                         size_t buflen)
6111 {
6112         struct nfs_server *server = NFS_SERVER(inode);
6113         struct nfs4_label label = {0, 0, buflen, buf};
6114
6115         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6116         struct nfs_fattr fattr = {
6117                 .label = &label,
6118         };
6119         struct nfs4_getattr_arg arg = {
6120                 .fh             = NFS_FH(inode),
6121                 .bitmask        = bitmask,
6122         };
6123         struct nfs4_getattr_res res = {
6124                 .fattr          = &fattr,
6125                 .server         = server,
6126         };
6127         struct rpc_message msg = {
6128                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6129                 .rpc_argp       = &arg,
6130                 .rpc_resp       = &res,
6131         };
6132         int ret;
6133
6134         nfs_fattr_init(&fattr);
6135
6136         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6137         if (ret)
6138                 return ret;
6139         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6140                 return -ENOENT;
6141         return label.len;
6142 }
6143
6144 static int nfs4_get_security_label(struct inode *inode, void *buf,
6145                                         size_t buflen)
6146 {
6147         struct nfs4_exception exception = {
6148                 .interruptible = true,
6149         };
6150         int err;
6151
6152         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6153                 return -EOPNOTSUPP;
6154
6155         do {
6156                 err = _nfs4_get_security_label(inode, buf, buflen);
6157                 trace_nfs4_get_security_label(inode, err);
6158                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6159                                 &exception);
6160         } while (exception.retry);
6161         return err;
6162 }
6163
6164 static int _nfs4_do_set_security_label(struct inode *inode,
6165                 struct nfs4_label *ilabel,
6166                 struct nfs_fattr *fattr)
6167 {
6168
6169         struct iattr sattr = {0};
6170         struct nfs_server *server = NFS_SERVER(inode);
6171         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6172         struct nfs_setattrargs arg = {
6173                 .fh             = NFS_FH(inode),
6174                 .iap            = &sattr,
6175                 .server         = server,
6176                 .bitmask        = bitmask,
6177                 .label          = ilabel,
6178         };
6179         struct nfs_setattrres res = {
6180                 .fattr          = fattr,
6181                 .server         = server,
6182         };
6183         struct rpc_message msg = {
6184                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6185                 .rpc_argp       = &arg,
6186                 .rpc_resp       = &res,
6187         };
6188         int status;
6189
6190         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6191
6192         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6193         if (status)
6194                 dprintk("%s failed: %d\n", __func__, status);
6195
6196         return status;
6197 }
6198
6199 static int nfs4_do_set_security_label(struct inode *inode,
6200                 struct nfs4_label *ilabel,
6201                 struct nfs_fattr *fattr)
6202 {
6203         struct nfs4_exception exception = { };
6204         int err;
6205
6206         do {
6207                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6208                 trace_nfs4_set_security_label(inode, err);
6209                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6210                                 &exception);
6211         } while (exception.retry);
6212         return err;
6213 }
6214
6215 static int
6216 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6217 {
6218         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6219         struct nfs_fattr *fattr;
6220         int status;
6221
6222         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6223                 return -EOPNOTSUPP;
6224
6225         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6226         if (fattr == NULL)
6227                 return -ENOMEM;
6228
6229         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6230         if (status == 0)
6231                 nfs_setsecurity(inode, fattr);
6232
6233         return status;
6234 }
6235 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6236
6237
6238 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6239                                     nfs4_verifier *bootverf)
6240 {
6241         __be32 verf[2];
6242
6243         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6244                 /* An impossible timestamp guarantees this value
6245                  * will never match a generated boot time. */
6246                 verf[0] = cpu_to_be32(U32_MAX);
6247                 verf[1] = cpu_to_be32(U32_MAX);
6248         } else {
6249                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6250                 u64 ns = ktime_to_ns(nn->boot_time);
6251
6252                 verf[0] = cpu_to_be32(ns >> 32);
6253                 verf[1] = cpu_to_be32(ns);
6254         }
6255         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6256 }
6257
6258 static size_t
6259 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6260 {
6261         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6262         struct nfs_netns_client *nn_clp = nn->nfs_client;
6263         const char *id;
6264
6265         buf[0] = '\0';
6266
6267         if (nn_clp) {
6268                 rcu_read_lock();
6269                 id = rcu_dereference(nn_clp->identifier);
6270                 if (id)
6271                         strscpy(buf, id, buflen);
6272                 rcu_read_unlock();
6273         }
6274
6275         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6276                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6277
6278         return strlen(buf);
6279 }
6280
6281 static int
6282 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6283 {
6284         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6285         size_t buflen;
6286         size_t len;
6287         char *str;
6288
6289         if (clp->cl_owner_id != NULL)
6290                 return 0;
6291
6292         rcu_read_lock();
6293         len = 14 +
6294                 strlen(clp->cl_rpcclient->cl_nodename) +
6295                 1 +
6296                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6297                 1;
6298         rcu_read_unlock();
6299
6300         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6301         if (buflen)
6302                 len += buflen + 1;
6303
6304         if (len > NFS4_OPAQUE_LIMIT + 1)
6305                 return -EINVAL;
6306
6307         /*
6308          * Since this string is allocated at mount time, and held until the
6309          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6310          * about a memory-reclaim deadlock.
6311          */
6312         str = kmalloc(len, GFP_KERNEL);
6313         if (!str)
6314                 return -ENOMEM;
6315
6316         rcu_read_lock();
6317         if (buflen)
6318                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6319                           clp->cl_rpcclient->cl_nodename, buf,
6320                           rpc_peeraddr2str(clp->cl_rpcclient,
6321                                            RPC_DISPLAY_ADDR));
6322         else
6323                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6324                           clp->cl_rpcclient->cl_nodename,
6325                           rpc_peeraddr2str(clp->cl_rpcclient,
6326                                            RPC_DISPLAY_ADDR));
6327         rcu_read_unlock();
6328
6329         clp->cl_owner_id = str;
6330         return 0;
6331 }
6332
6333 static int
6334 nfs4_init_uniform_client_string(struct nfs_client *clp)
6335 {
6336         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6337         size_t buflen;
6338         size_t len;
6339         char *str;
6340
6341         if (clp->cl_owner_id != NULL)
6342                 return 0;
6343
6344         len = 10 + 10 + 1 + 10 + 1 +
6345                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6346
6347         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6348         if (buflen)
6349                 len += buflen + 1;
6350
6351         if (len > NFS4_OPAQUE_LIMIT + 1)
6352                 return -EINVAL;
6353
6354         /*
6355          * Since this string is allocated at mount time, and held until the
6356          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6357          * about a memory-reclaim deadlock.
6358          */
6359         str = kmalloc(len, GFP_KERNEL);
6360         if (!str)
6361                 return -ENOMEM;
6362
6363         if (buflen)
6364                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6365                           clp->rpc_ops->version, clp->cl_minorversion,
6366                           buf, clp->cl_rpcclient->cl_nodename);
6367         else
6368                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6369                           clp->rpc_ops->version, clp->cl_minorversion,
6370                           clp->cl_rpcclient->cl_nodename);
6371         clp->cl_owner_id = str;
6372         return 0;
6373 }
6374
6375 /*
6376  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6377  * services.  Advertise one based on the address family of the
6378  * clientaddr.
6379  */
6380 static unsigned int
6381 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6382 {
6383         if (strchr(clp->cl_ipaddr, ':') != NULL)
6384                 return scnprintf(buf, len, "tcp6");
6385         else
6386                 return scnprintf(buf, len, "tcp");
6387 }
6388
6389 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6390 {
6391         struct nfs4_setclientid *sc = calldata;
6392
6393         if (task->tk_status == 0)
6394                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6395 }
6396
6397 static const struct rpc_call_ops nfs4_setclientid_ops = {
6398         .rpc_call_done = nfs4_setclientid_done,
6399 };
6400
6401 /**
6402  * nfs4_proc_setclientid - Negotiate client ID
6403  * @clp: state data structure
6404  * @program: RPC program for NFSv4 callback service
6405  * @port: IP port number for NFS4 callback service
6406  * @cred: credential to use for this call
6407  * @res: where to place the result
6408  *
6409  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6410  */
6411 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6412                 unsigned short port, const struct cred *cred,
6413                 struct nfs4_setclientid_res *res)
6414 {
6415         nfs4_verifier sc_verifier;
6416         struct nfs4_setclientid setclientid = {
6417                 .sc_verifier = &sc_verifier,
6418                 .sc_prog = program,
6419                 .sc_clnt = clp,
6420         };
6421         struct rpc_message msg = {
6422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6423                 .rpc_argp = &setclientid,
6424                 .rpc_resp = res,
6425                 .rpc_cred = cred,
6426         };
6427         struct rpc_task_setup task_setup_data = {
6428                 .rpc_client = clp->cl_rpcclient,
6429                 .rpc_message = &msg,
6430                 .callback_ops = &nfs4_setclientid_ops,
6431                 .callback_data = &setclientid,
6432                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6433         };
6434         unsigned long now = jiffies;
6435         int status;
6436
6437         /* nfs_client_id4 */
6438         nfs4_init_boot_verifier(clp, &sc_verifier);
6439
6440         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6441                 status = nfs4_init_uniform_client_string(clp);
6442         else
6443                 status = nfs4_init_nonuniform_client_string(clp);
6444
6445         if (status)
6446                 goto out;
6447
6448         /* cb_client4 */
6449         setclientid.sc_netid_len =
6450                                 nfs4_init_callback_netid(clp,
6451                                                 setclientid.sc_netid,
6452                                                 sizeof(setclientid.sc_netid));
6453         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6454                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6455                                 clp->cl_ipaddr, port >> 8, port & 255);
6456
6457         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6458                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6459                 clp->cl_owner_id);
6460
6461         status = nfs4_call_sync_custom(&task_setup_data);
6462         if (setclientid.sc_cred) {
6463                 kfree(clp->cl_acceptor);
6464                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6465                 put_rpccred(setclientid.sc_cred);
6466         }
6467
6468         if (status == 0)
6469                 do_renew_lease(clp, now);
6470 out:
6471         trace_nfs4_setclientid(clp, status);
6472         dprintk("NFS reply setclientid: %d\n", status);
6473         return status;
6474 }
6475
6476 /**
6477  * nfs4_proc_setclientid_confirm - Confirm client ID
6478  * @clp: state data structure
6479  * @arg: result of a previous SETCLIENTID
6480  * @cred: credential to use for this call
6481  *
6482  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6483  */
6484 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6485                 struct nfs4_setclientid_res *arg,
6486                 const struct cred *cred)
6487 {
6488         struct rpc_message msg = {
6489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6490                 .rpc_argp = arg,
6491                 .rpc_cred = cred,
6492         };
6493         int status;
6494
6495         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6496                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6497                 clp->cl_clientid);
6498         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6499                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6500         trace_nfs4_setclientid_confirm(clp, status);
6501         dprintk("NFS reply setclientid_confirm: %d\n", status);
6502         return status;
6503 }
6504
6505 struct nfs4_delegreturndata {
6506         struct nfs4_delegreturnargs args;
6507         struct nfs4_delegreturnres res;
6508         struct nfs_fh fh;
6509         nfs4_stateid stateid;
6510         unsigned long timestamp;
6511         struct {
6512                 struct nfs4_layoutreturn_args arg;
6513                 struct nfs4_layoutreturn_res res;
6514                 struct nfs4_xdr_opaque_data ld_private;
6515                 u32 roc_barrier;
6516                 bool roc;
6517         } lr;
6518         struct nfs_fattr fattr;
6519         int rpc_status;
6520         struct inode *inode;
6521 };
6522
6523 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6524 {
6525         struct nfs4_delegreturndata *data = calldata;
6526         struct nfs4_exception exception = {
6527                 .inode = data->inode,
6528                 .stateid = &data->stateid,
6529                 .task_is_privileged = data->args.seq_args.sa_privileged,
6530         };
6531
6532         if (!nfs4_sequence_done(task, &data->res.seq_res))
6533                 return;
6534
6535         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6536
6537         /* Handle Layoutreturn errors */
6538         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6539                           &data->res.lr_ret) == -EAGAIN)
6540                 goto out_restart;
6541
6542         switch (task->tk_status) {
6543         case 0:
6544                 renew_lease(data->res.server, data->timestamp);
6545                 break;
6546         case -NFS4ERR_ADMIN_REVOKED:
6547         case -NFS4ERR_DELEG_REVOKED:
6548         case -NFS4ERR_EXPIRED:
6549                 nfs4_free_revoked_stateid(data->res.server,
6550                                 data->args.stateid,
6551                                 task->tk_msg.rpc_cred);
6552                 fallthrough;
6553         case -NFS4ERR_BAD_STATEID:
6554         case -NFS4ERR_STALE_STATEID:
6555         case -ETIMEDOUT:
6556                 task->tk_status = 0;
6557                 break;
6558         case -NFS4ERR_OLD_STATEID:
6559                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6560                         nfs4_stateid_seqid_inc(&data->stateid);
6561                 if (data->args.bitmask) {
6562                         data->args.bitmask = NULL;
6563                         data->res.fattr = NULL;
6564                 }
6565                 goto out_restart;
6566         case -NFS4ERR_ACCESS:
6567                 if (data->args.bitmask) {
6568                         data->args.bitmask = NULL;
6569                         data->res.fattr = NULL;
6570                         goto out_restart;
6571                 }
6572                 fallthrough;
6573         default:
6574                 task->tk_status = nfs4_async_handle_exception(task,
6575                                 data->res.server, task->tk_status,
6576                                 &exception);
6577                 if (exception.retry)
6578                         goto out_restart;
6579         }
6580         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6581         data->rpc_status = task->tk_status;
6582         return;
6583 out_restart:
6584         task->tk_status = 0;
6585         rpc_restart_call_prepare(task);
6586 }
6587
6588 static void nfs4_delegreturn_release(void *calldata)
6589 {
6590         struct nfs4_delegreturndata *data = calldata;
6591         struct inode *inode = data->inode;
6592
6593         if (data->lr.roc)
6594                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6595                                  data->res.lr_ret);
6596         if (inode) {
6597                 nfs4_fattr_set_prechange(&data->fattr,
6598                                          inode_peek_iversion_raw(inode));
6599                 nfs_refresh_inode(inode, &data->fattr);
6600                 nfs_iput_and_deactive(inode);
6601         }
6602         kfree(calldata);
6603 }
6604
6605 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6606 {
6607         struct nfs4_delegreturndata *d_data;
6608         struct pnfs_layout_hdr *lo;
6609
6610         d_data = (struct nfs4_delegreturndata *)data;
6611
6612         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6613                 nfs4_sequence_done(task, &d_data->res.seq_res);
6614                 return;
6615         }
6616
6617         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6618         if (lo && !pnfs_layout_is_valid(lo)) {
6619                 d_data->args.lr_args = NULL;
6620                 d_data->res.lr_res = NULL;
6621         }
6622
6623         nfs4_setup_sequence(d_data->res.server->nfs_client,
6624                         &d_data->args.seq_args,
6625                         &d_data->res.seq_res,
6626                         task);
6627 }
6628
6629 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6630         .rpc_call_prepare = nfs4_delegreturn_prepare,
6631         .rpc_call_done = nfs4_delegreturn_done,
6632         .rpc_release = nfs4_delegreturn_release,
6633 };
6634
6635 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6636 {
6637         struct nfs4_delegreturndata *data;
6638         struct nfs_server *server = NFS_SERVER(inode);
6639         struct rpc_task *task;
6640         struct rpc_message msg = {
6641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6642                 .rpc_cred = cred,
6643         };
6644         struct rpc_task_setup task_setup_data = {
6645                 .rpc_client = server->client,
6646                 .rpc_message = &msg,
6647                 .callback_ops = &nfs4_delegreturn_ops,
6648                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6649         };
6650         int status = 0;
6651
6652         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6653                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6654
6655         data = kzalloc(sizeof(*data), GFP_KERNEL);
6656         if (data == NULL)
6657                 return -ENOMEM;
6658
6659         nfs4_state_protect(server->nfs_client,
6660                         NFS_SP4_MACH_CRED_CLEANUP,
6661                         &task_setup_data.rpc_client, &msg);
6662
6663         data->args.fhandle = &data->fh;
6664         data->args.stateid = &data->stateid;
6665         nfs4_bitmask_set(data->args.bitmask_store,
6666                          server->cache_consistency_bitmask, inode, 0);
6667         data->args.bitmask = data->args.bitmask_store;
6668         nfs_copy_fh(&data->fh, NFS_FH(inode));
6669         nfs4_stateid_copy(&data->stateid, stateid);
6670         data->res.fattr = &data->fattr;
6671         data->res.server = server;
6672         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6673         data->lr.arg.ld_private = &data->lr.ld_private;
6674         nfs_fattr_init(data->res.fattr);
6675         data->timestamp = jiffies;
6676         data->rpc_status = 0;
6677         data->inode = nfs_igrab_and_active(inode);
6678         if (data->inode || issync) {
6679                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6680                                         cred);
6681                 if (data->lr.roc) {
6682                         data->args.lr_args = &data->lr.arg;
6683                         data->res.lr_res = &data->lr.res;
6684                 }
6685         }
6686
6687         if (!data->inode)
6688                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6689                                    1);
6690         else
6691                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6692                                    0);
6693         task_setup_data.callback_data = data;
6694         msg.rpc_argp = &data->args;
6695         msg.rpc_resp = &data->res;
6696         task = rpc_run_task(&task_setup_data);
6697         if (IS_ERR(task))
6698                 return PTR_ERR(task);
6699         if (!issync)
6700                 goto out;
6701         status = rpc_wait_for_completion_task(task);
6702         if (status != 0)
6703                 goto out;
6704         status = data->rpc_status;
6705 out:
6706         rpc_put_task(task);
6707         return status;
6708 }
6709
6710 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6711 {
6712         struct nfs_server *server = NFS_SERVER(inode);
6713         struct nfs4_exception exception = { };
6714         int err;
6715         do {
6716                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6717                 trace_nfs4_delegreturn(inode, stateid, err);
6718                 switch (err) {
6719                         case -NFS4ERR_STALE_STATEID:
6720                         case -NFS4ERR_EXPIRED:
6721                         case 0:
6722                                 return 0;
6723                 }
6724                 err = nfs4_handle_exception(server, err, &exception);
6725         } while (exception.retry);
6726         return err;
6727 }
6728
6729 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6730 {
6731         struct inode *inode = state->inode;
6732         struct nfs_server *server = NFS_SERVER(inode);
6733         struct nfs_client *clp = server->nfs_client;
6734         struct nfs_lockt_args arg = {
6735                 .fh = NFS_FH(inode),
6736                 .fl = request,
6737         };
6738         struct nfs_lockt_res res = {
6739                 .denied = request,
6740         };
6741         struct rpc_message msg = {
6742                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6743                 .rpc_argp       = &arg,
6744                 .rpc_resp       = &res,
6745                 .rpc_cred       = state->owner->so_cred,
6746         };
6747         struct nfs4_lock_state *lsp;
6748         int status;
6749
6750         arg.lock_owner.clientid = clp->cl_clientid;
6751         status = nfs4_set_lock_state(state, request);
6752         if (status != 0)
6753                 goto out;
6754         lsp = request->fl_u.nfs4_fl.owner;
6755         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6756         arg.lock_owner.s_dev = server->s_dev;
6757         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6758         switch (status) {
6759                 case 0:
6760                         request->fl_type = F_UNLCK;
6761                         break;
6762                 case -NFS4ERR_DENIED:
6763                         status = 0;
6764         }
6765         request->fl_ops->fl_release_private(request);
6766         request->fl_ops = NULL;
6767 out:
6768         return status;
6769 }
6770
6771 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6772 {
6773         struct nfs4_exception exception = {
6774                 .interruptible = true,
6775         };
6776         int err;
6777
6778         do {
6779                 err = _nfs4_proc_getlk(state, cmd, request);
6780                 trace_nfs4_get_lock(request, state, cmd, err);
6781                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6782                                 &exception);
6783         } while (exception.retry);
6784         return err;
6785 }
6786
6787 /*
6788  * Update the seqid of a lock stateid after receiving
6789  * NFS4ERR_OLD_STATEID
6790  */
6791 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6792                 struct nfs4_lock_state *lsp)
6793 {
6794         struct nfs4_state *state = lsp->ls_state;
6795         bool ret = false;
6796
6797         spin_lock(&state->state_lock);
6798         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6799                 goto out;
6800         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6801                 nfs4_stateid_seqid_inc(dst);
6802         else
6803                 dst->seqid = lsp->ls_stateid.seqid;
6804         ret = true;
6805 out:
6806         spin_unlock(&state->state_lock);
6807         return ret;
6808 }
6809
6810 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6811                 struct nfs4_lock_state *lsp)
6812 {
6813         struct nfs4_state *state = lsp->ls_state;
6814         bool ret;
6815
6816         spin_lock(&state->state_lock);
6817         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6818         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6819         spin_unlock(&state->state_lock);
6820         return ret;
6821 }
6822
6823 struct nfs4_unlockdata {
6824         struct nfs_locku_args arg;
6825         struct nfs_locku_res res;
6826         struct nfs4_lock_state *lsp;
6827         struct nfs_open_context *ctx;
6828         struct nfs_lock_context *l_ctx;
6829         struct file_lock fl;
6830         struct nfs_server *server;
6831         unsigned long timestamp;
6832 };
6833
6834 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6835                 struct nfs_open_context *ctx,
6836                 struct nfs4_lock_state *lsp,
6837                 struct nfs_seqid *seqid)
6838 {
6839         struct nfs4_unlockdata *p;
6840         struct nfs4_state *state = lsp->ls_state;
6841         struct inode *inode = state->inode;
6842
6843         p = kzalloc(sizeof(*p), GFP_KERNEL);
6844         if (p == NULL)
6845                 return NULL;
6846         p->arg.fh = NFS_FH(inode);
6847         p->arg.fl = &p->fl;
6848         p->arg.seqid = seqid;
6849         p->res.seqid = seqid;
6850         p->lsp = lsp;
6851         /* Ensure we don't close file until we're done freeing locks! */
6852         p->ctx = get_nfs_open_context(ctx);
6853         p->l_ctx = nfs_get_lock_context(ctx);
6854         locks_init_lock(&p->fl);
6855         locks_copy_lock(&p->fl, fl);
6856         p->server = NFS_SERVER(inode);
6857         spin_lock(&state->state_lock);
6858         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6859         spin_unlock(&state->state_lock);
6860         return p;
6861 }
6862
6863 static void nfs4_locku_release_calldata(void *data)
6864 {
6865         struct nfs4_unlockdata *calldata = data;
6866         nfs_free_seqid(calldata->arg.seqid);
6867         nfs4_put_lock_state(calldata->lsp);
6868         nfs_put_lock_context(calldata->l_ctx);
6869         put_nfs_open_context(calldata->ctx);
6870         kfree(calldata);
6871 }
6872
6873 static void nfs4_locku_done(struct rpc_task *task, void *data)
6874 {
6875         struct nfs4_unlockdata *calldata = data;
6876         struct nfs4_exception exception = {
6877                 .inode = calldata->lsp->ls_state->inode,
6878                 .stateid = &calldata->arg.stateid,
6879         };
6880
6881         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6882                 return;
6883         switch (task->tk_status) {
6884                 case 0:
6885                         renew_lease(calldata->server, calldata->timestamp);
6886                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6887                         if (nfs4_update_lock_stateid(calldata->lsp,
6888                                         &calldata->res.stateid))
6889                                 break;
6890                         fallthrough;
6891                 case -NFS4ERR_ADMIN_REVOKED:
6892                 case -NFS4ERR_EXPIRED:
6893                         nfs4_free_revoked_stateid(calldata->server,
6894                                         &calldata->arg.stateid,
6895                                         task->tk_msg.rpc_cred);
6896                         fallthrough;
6897                 case -NFS4ERR_BAD_STATEID:
6898                 case -NFS4ERR_STALE_STATEID:
6899                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6900                                                 calldata->lsp))
6901                                 rpc_restart_call_prepare(task);
6902                         break;
6903                 case -NFS4ERR_OLD_STATEID:
6904                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6905                                                 calldata->lsp))
6906                                 rpc_restart_call_prepare(task);
6907                         break;
6908                 default:
6909                         task->tk_status = nfs4_async_handle_exception(task,
6910                                         calldata->server, task->tk_status,
6911                                         &exception);
6912                         if (exception.retry)
6913                                 rpc_restart_call_prepare(task);
6914         }
6915         nfs_release_seqid(calldata->arg.seqid);
6916 }
6917
6918 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6919 {
6920         struct nfs4_unlockdata *calldata = data;
6921
6922         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6923                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6924                 return;
6925
6926         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6927                 goto out_wait;
6928         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6929                 /* Note: exit _without_ running nfs4_locku_done */
6930                 goto out_no_action;
6931         }
6932         calldata->timestamp = jiffies;
6933         if (nfs4_setup_sequence(calldata->server->nfs_client,
6934                                 &calldata->arg.seq_args,
6935                                 &calldata->res.seq_res,
6936                                 task) != 0)
6937                 nfs_release_seqid(calldata->arg.seqid);
6938         return;
6939 out_no_action:
6940         task->tk_action = NULL;
6941 out_wait:
6942         nfs4_sequence_done(task, &calldata->res.seq_res);
6943 }
6944
6945 static const struct rpc_call_ops nfs4_locku_ops = {
6946         .rpc_call_prepare = nfs4_locku_prepare,
6947         .rpc_call_done = nfs4_locku_done,
6948         .rpc_release = nfs4_locku_release_calldata,
6949 };
6950
6951 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6952                 struct nfs_open_context *ctx,
6953                 struct nfs4_lock_state *lsp,
6954                 struct nfs_seqid *seqid)
6955 {
6956         struct nfs4_unlockdata *data;
6957         struct rpc_message msg = {
6958                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6959                 .rpc_cred = ctx->cred,
6960         };
6961         struct rpc_task_setup task_setup_data = {
6962                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6963                 .rpc_message = &msg,
6964                 .callback_ops = &nfs4_locku_ops,
6965                 .workqueue = nfsiod_workqueue,
6966                 .flags = RPC_TASK_ASYNC,
6967         };
6968
6969         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6970                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6971
6972         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6973                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6974
6975         /* Ensure this is an unlock - when canceling a lock, the
6976          * canceled lock is passed in, and it won't be an unlock.
6977          */
6978         fl->fl_type = F_UNLCK;
6979         if (fl->fl_flags & FL_CLOSE)
6980                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6981
6982         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6983         if (data == NULL) {
6984                 nfs_free_seqid(seqid);
6985                 return ERR_PTR(-ENOMEM);
6986         }
6987
6988         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6989         msg.rpc_argp = &data->arg;
6990         msg.rpc_resp = &data->res;
6991         task_setup_data.callback_data = data;
6992         return rpc_run_task(&task_setup_data);
6993 }
6994
6995 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6996 {
6997         struct inode *inode = state->inode;
6998         struct nfs4_state_owner *sp = state->owner;
6999         struct nfs_inode *nfsi = NFS_I(inode);
7000         struct nfs_seqid *seqid;
7001         struct nfs4_lock_state *lsp;
7002         struct rpc_task *task;
7003         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7004         int status = 0;
7005         unsigned char fl_flags = request->fl_flags;
7006
7007         status = nfs4_set_lock_state(state, request);
7008         /* Unlock _before_ we do the RPC call */
7009         request->fl_flags |= FL_EXISTS;
7010         /* Exclude nfs_delegation_claim_locks() */
7011         mutex_lock(&sp->so_delegreturn_mutex);
7012         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7013         down_read(&nfsi->rwsem);
7014         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7015                 up_read(&nfsi->rwsem);
7016                 mutex_unlock(&sp->so_delegreturn_mutex);
7017                 goto out;
7018         }
7019         up_read(&nfsi->rwsem);
7020         mutex_unlock(&sp->so_delegreturn_mutex);
7021         if (status != 0)
7022                 goto out;
7023         /* Is this a delegated lock? */
7024         lsp = request->fl_u.nfs4_fl.owner;
7025         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7026                 goto out;
7027         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7028         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7029         status = -ENOMEM;
7030         if (IS_ERR(seqid))
7031                 goto out;
7032         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7033         status = PTR_ERR(task);
7034         if (IS_ERR(task))
7035                 goto out;
7036         status = rpc_wait_for_completion_task(task);
7037         rpc_put_task(task);
7038 out:
7039         request->fl_flags = fl_flags;
7040         trace_nfs4_unlock(request, state, F_SETLK, status);
7041         return status;
7042 }
7043
7044 struct nfs4_lockdata {
7045         struct nfs_lock_args arg;
7046         struct nfs_lock_res res;
7047         struct nfs4_lock_state *lsp;
7048         struct nfs_open_context *ctx;
7049         struct file_lock fl;
7050         unsigned long timestamp;
7051         int rpc_status;
7052         int cancelled;
7053         struct nfs_server *server;
7054 };
7055
7056 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7057                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7058                 gfp_t gfp_mask)
7059 {
7060         struct nfs4_lockdata *p;
7061         struct inode *inode = lsp->ls_state->inode;
7062         struct nfs_server *server = NFS_SERVER(inode);
7063         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7064
7065         p = kzalloc(sizeof(*p), gfp_mask);
7066         if (p == NULL)
7067                 return NULL;
7068
7069         p->arg.fh = NFS_FH(inode);
7070         p->arg.fl = &p->fl;
7071         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7072         if (IS_ERR(p->arg.open_seqid))
7073                 goto out_free;
7074         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7075         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7076         if (IS_ERR(p->arg.lock_seqid))
7077                 goto out_free_seqid;
7078         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7079         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7080         p->arg.lock_owner.s_dev = server->s_dev;
7081         p->res.lock_seqid = p->arg.lock_seqid;
7082         p->lsp = lsp;
7083         p->server = server;
7084         p->ctx = get_nfs_open_context(ctx);
7085         locks_init_lock(&p->fl);
7086         locks_copy_lock(&p->fl, fl);
7087         return p;
7088 out_free_seqid:
7089         nfs_free_seqid(p->arg.open_seqid);
7090 out_free:
7091         kfree(p);
7092         return NULL;
7093 }
7094
7095 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7096 {
7097         struct nfs4_lockdata *data = calldata;
7098         struct nfs4_state *state = data->lsp->ls_state;
7099
7100         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7101                 goto out_wait;
7102         /* Do we need to do an open_to_lock_owner? */
7103         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7104                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7105                         goto out_release_lock_seqid;
7106                 }
7107                 nfs4_stateid_copy(&data->arg.open_stateid,
7108                                 &state->open_stateid);
7109                 data->arg.new_lock_owner = 1;
7110                 data->res.open_seqid = data->arg.open_seqid;
7111         } else {
7112                 data->arg.new_lock_owner = 0;
7113                 nfs4_stateid_copy(&data->arg.lock_stateid,
7114                                 &data->lsp->ls_stateid);
7115         }
7116         if (!nfs4_valid_open_stateid(state)) {
7117                 data->rpc_status = -EBADF;
7118                 task->tk_action = NULL;
7119                 goto out_release_open_seqid;
7120         }
7121         data->timestamp = jiffies;
7122         if (nfs4_setup_sequence(data->server->nfs_client,
7123                                 &data->arg.seq_args,
7124                                 &data->res.seq_res,
7125                                 task) == 0)
7126                 return;
7127 out_release_open_seqid:
7128         nfs_release_seqid(data->arg.open_seqid);
7129 out_release_lock_seqid:
7130         nfs_release_seqid(data->arg.lock_seqid);
7131 out_wait:
7132         nfs4_sequence_done(task, &data->res.seq_res);
7133         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7134 }
7135
7136 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7137 {
7138         struct nfs4_lockdata *data = calldata;
7139         struct nfs4_lock_state *lsp = data->lsp;
7140
7141         if (!nfs4_sequence_done(task, &data->res.seq_res))
7142                 return;
7143
7144         data->rpc_status = task->tk_status;
7145         switch (task->tk_status) {
7146         case 0:
7147                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7148                                 data->timestamp);
7149                 if (data->arg.new_lock && !data->cancelled) {
7150                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7151                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7152                                 goto out_restart;
7153                 }
7154                 if (data->arg.new_lock_owner != 0) {
7155                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7156                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7157                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7158                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7159                         goto out_restart;
7160                 break;
7161         case -NFS4ERR_BAD_STATEID:
7162         case -NFS4ERR_OLD_STATEID:
7163         case -NFS4ERR_STALE_STATEID:
7164         case -NFS4ERR_EXPIRED:
7165                 if (data->arg.new_lock_owner != 0) {
7166                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7167                                                 &lsp->ls_state->open_stateid))
7168                                 goto out_restart;
7169                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7170                                                 &lsp->ls_stateid))
7171                                 goto out_restart;
7172         }
7173 out_done:
7174         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7175         return;
7176 out_restart:
7177         if (!data->cancelled)
7178                 rpc_restart_call_prepare(task);
7179         goto out_done;
7180 }
7181
7182 static void nfs4_lock_release(void *calldata)
7183 {
7184         struct nfs4_lockdata *data = calldata;
7185
7186         nfs_free_seqid(data->arg.open_seqid);
7187         if (data->cancelled && data->rpc_status == 0) {
7188                 struct rpc_task *task;
7189                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7190                                 data->arg.lock_seqid);
7191                 if (!IS_ERR(task))
7192                         rpc_put_task_async(task);
7193                 dprintk("%s: cancelling lock!\n", __func__);
7194         } else
7195                 nfs_free_seqid(data->arg.lock_seqid);
7196         nfs4_put_lock_state(data->lsp);
7197         put_nfs_open_context(data->ctx);
7198         kfree(data);
7199 }
7200
7201 static const struct rpc_call_ops nfs4_lock_ops = {
7202         .rpc_call_prepare = nfs4_lock_prepare,
7203         .rpc_call_done = nfs4_lock_done,
7204         .rpc_release = nfs4_lock_release,
7205 };
7206
7207 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7208 {
7209         switch (error) {
7210         case -NFS4ERR_ADMIN_REVOKED:
7211         case -NFS4ERR_EXPIRED:
7212         case -NFS4ERR_BAD_STATEID:
7213                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7214                 if (new_lock_owner != 0 ||
7215                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7216                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7217                 break;
7218         case -NFS4ERR_STALE_STATEID:
7219                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7220                 nfs4_schedule_lease_recovery(server->nfs_client);
7221         }
7222 }
7223
7224 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7225 {
7226         struct nfs4_lockdata *data;
7227         struct rpc_task *task;
7228         struct rpc_message msg = {
7229                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7230                 .rpc_cred = state->owner->so_cred,
7231         };
7232         struct rpc_task_setup task_setup_data = {
7233                 .rpc_client = NFS_CLIENT(state->inode),
7234                 .rpc_message = &msg,
7235                 .callback_ops = &nfs4_lock_ops,
7236                 .workqueue = nfsiod_workqueue,
7237                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7238         };
7239         int ret;
7240
7241         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7242                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7243
7244         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7245                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7246         if (data == NULL)
7247                 return -ENOMEM;
7248         if (IS_SETLKW(cmd))
7249                 data->arg.block = 1;
7250         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7251                                 recovery_type > NFS_LOCK_NEW);
7252         msg.rpc_argp = &data->arg;
7253         msg.rpc_resp = &data->res;
7254         task_setup_data.callback_data = data;
7255         if (recovery_type > NFS_LOCK_NEW) {
7256                 if (recovery_type == NFS_LOCK_RECLAIM)
7257                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7258         } else
7259                 data->arg.new_lock = 1;
7260         task = rpc_run_task(&task_setup_data);
7261         if (IS_ERR(task))
7262                 return PTR_ERR(task);
7263         ret = rpc_wait_for_completion_task(task);
7264         if (ret == 0) {
7265                 ret = data->rpc_status;
7266                 if (ret)
7267                         nfs4_handle_setlk_error(data->server, data->lsp,
7268                                         data->arg.new_lock_owner, ret);
7269         } else
7270                 data->cancelled = true;
7271         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7272         rpc_put_task(task);
7273         dprintk("%s: ret = %d\n", __func__, ret);
7274         return ret;
7275 }
7276
7277 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7278 {
7279         struct nfs_server *server = NFS_SERVER(state->inode);
7280         struct nfs4_exception exception = {
7281                 .inode = state->inode,
7282         };
7283         int err;
7284
7285         do {
7286                 /* Cache the lock if possible... */
7287                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7288                         return 0;
7289                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7290                 if (err != -NFS4ERR_DELAY)
7291                         break;
7292                 nfs4_handle_exception(server, err, &exception);
7293         } while (exception.retry);
7294         return err;
7295 }
7296
7297 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7298 {
7299         struct nfs_server *server = NFS_SERVER(state->inode);
7300         struct nfs4_exception exception = {
7301                 .inode = state->inode,
7302         };
7303         int err;
7304
7305         err = nfs4_set_lock_state(state, request);
7306         if (err != 0)
7307                 return err;
7308         if (!recover_lost_locks) {
7309                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7310                 return 0;
7311         }
7312         do {
7313                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7314                         return 0;
7315                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7316                 switch (err) {
7317                 default:
7318                         goto out;
7319                 case -NFS4ERR_GRACE:
7320                 case -NFS4ERR_DELAY:
7321                         nfs4_handle_exception(server, err, &exception);
7322                         err = 0;
7323                 }
7324         } while (exception.retry);
7325 out:
7326         return err;
7327 }
7328
7329 #if defined(CONFIG_NFS_V4_1)
7330 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7331 {
7332         struct nfs4_lock_state *lsp;
7333         int status;
7334
7335         status = nfs4_set_lock_state(state, request);
7336         if (status != 0)
7337                 return status;
7338         lsp = request->fl_u.nfs4_fl.owner;
7339         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7340             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7341                 return 0;
7342         return nfs4_lock_expired(state, request);
7343 }
7344 #endif
7345
7346 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7347 {
7348         struct nfs_inode *nfsi = NFS_I(state->inode);
7349         struct nfs4_state_owner *sp = state->owner;
7350         unsigned char fl_flags = request->fl_flags;
7351         int status;
7352
7353         request->fl_flags |= FL_ACCESS;
7354         status = locks_lock_inode_wait(state->inode, request);
7355         if (status < 0)
7356                 goto out;
7357         mutex_lock(&sp->so_delegreturn_mutex);
7358         down_read(&nfsi->rwsem);
7359         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7360                 /* Yes: cache locks! */
7361                 /* ...but avoid races with delegation recall... */
7362                 request->fl_flags = fl_flags & ~FL_SLEEP;
7363                 status = locks_lock_inode_wait(state->inode, request);
7364                 up_read(&nfsi->rwsem);
7365                 mutex_unlock(&sp->so_delegreturn_mutex);
7366                 goto out;
7367         }
7368         up_read(&nfsi->rwsem);
7369         mutex_unlock(&sp->so_delegreturn_mutex);
7370         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7371 out:
7372         request->fl_flags = fl_flags;
7373         return status;
7374 }
7375
7376 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7377 {
7378         struct nfs4_exception exception = {
7379                 .state = state,
7380                 .inode = state->inode,
7381                 .interruptible = true,
7382         };
7383         int err;
7384
7385         do {
7386                 err = _nfs4_proc_setlk(state, cmd, request);
7387                 if (err == -NFS4ERR_DENIED)
7388                         err = -EAGAIN;
7389                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7390                                 err, &exception);
7391         } while (exception.retry);
7392         return err;
7393 }
7394
7395 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7396 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7397
7398 static int
7399 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7400                         struct file_lock *request)
7401 {
7402         int             status = -ERESTARTSYS;
7403         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7404
7405         while(!signalled()) {
7406                 status = nfs4_proc_setlk(state, cmd, request);
7407                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7408                         break;
7409                 freezable_schedule_timeout_interruptible(timeout);
7410                 timeout *= 2;
7411                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7412                 status = -ERESTARTSYS;
7413         }
7414         return status;
7415 }
7416
7417 #ifdef CONFIG_NFS_V4_1
7418 struct nfs4_lock_waiter {
7419         struct inode            *inode;
7420         struct nfs_lowner       owner;
7421         wait_queue_entry_t      wait;
7422 };
7423
7424 static int
7425 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7426 {
7427         struct nfs4_lock_waiter *waiter =
7428                 container_of(wait, struct nfs4_lock_waiter, wait);
7429
7430         /* NULL key means to wake up everyone */
7431         if (key) {
7432                 struct cb_notify_lock_args      *cbnl = key;
7433                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7434                                                 *wowner = &waiter->owner;
7435
7436                 /* Only wake if the callback was for the same owner. */
7437                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7438                         return 0;
7439
7440                 /* Make sure it's for the right inode */
7441                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7442                         return 0;
7443         }
7444
7445         return woken_wake_function(wait, mode, flags, key);
7446 }
7447
7448 static int
7449 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7450 {
7451         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7452         struct nfs_server *server = NFS_SERVER(state->inode);
7453         struct nfs_client *clp = server->nfs_client;
7454         wait_queue_head_t *q = &clp->cl_lock_waitq;
7455         struct nfs4_lock_waiter waiter = {
7456                 .inode = state->inode,
7457                 .owner = { .clientid = clp->cl_clientid,
7458                            .id = lsp->ls_seqid.owner_id,
7459                            .s_dev = server->s_dev },
7460         };
7461         int status;
7462
7463         /* Don't bother with waitqueue if we don't expect a callback */
7464         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7465                 return nfs4_retry_setlk_simple(state, cmd, request);
7466
7467         init_wait(&waiter.wait);
7468         waiter.wait.func = nfs4_wake_lock_waiter;
7469         add_wait_queue(q, &waiter.wait);
7470
7471         do {
7472                 status = nfs4_proc_setlk(state, cmd, request);
7473                 if (status != -EAGAIN || IS_SETLK(cmd))
7474                         break;
7475
7476                 status = -ERESTARTSYS;
7477                 freezer_do_not_count();
7478                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE,
7479                            NFS4_LOCK_MAXTIMEOUT);
7480                 freezer_count();
7481         } while (!signalled());
7482
7483         remove_wait_queue(q, &waiter.wait);
7484
7485         return status;
7486 }
7487 #else /* !CONFIG_NFS_V4_1 */
7488 static inline int
7489 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7490 {
7491         return nfs4_retry_setlk_simple(state, cmd, request);
7492 }
7493 #endif
7494
7495 static int
7496 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7497 {
7498         struct nfs_open_context *ctx;
7499         struct nfs4_state *state;
7500         int status;
7501
7502         /* verify open state */
7503         ctx = nfs_file_open_context(filp);
7504         state = ctx->state;
7505
7506         if (IS_GETLK(cmd)) {
7507                 if (state != NULL)
7508                         return nfs4_proc_getlk(state, F_GETLK, request);
7509                 return 0;
7510         }
7511
7512         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7513                 return -EINVAL;
7514
7515         if (request->fl_type == F_UNLCK) {
7516                 if (state != NULL)
7517                         return nfs4_proc_unlck(state, cmd, request);
7518                 return 0;
7519         }
7520
7521         if (state == NULL)
7522                 return -ENOLCK;
7523
7524         if ((request->fl_flags & FL_POSIX) &&
7525             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7526                 return -ENOLCK;
7527
7528         /*
7529          * Don't rely on the VFS having checked the file open mode,
7530          * since it won't do this for flock() locks.
7531          */
7532         switch (request->fl_type) {
7533         case F_RDLCK:
7534                 if (!(filp->f_mode & FMODE_READ))
7535                         return -EBADF;
7536                 break;
7537         case F_WRLCK:
7538                 if (!(filp->f_mode & FMODE_WRITE))
7539                         return -EBADF;
7540         }
7541
7542         status = nfs4_set_lock_state(state, request);
7543         if (status != 0)
7544                 return status;
7545
7546         return nfs4_retry_setlk(state, cmd, request);
7547 }
7548
7549 static int nfs4_delete_lease(struct file *file, void **priv)
7550 {
7551         return generic_setlease(file, F_UNLCK, NULL, priv);
7552 }
7553
7554 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7555                           void **priv)
7556 {
7557         struct inode *inode = file_inode(file);
7558         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7559         int ret;
7560
7561         /* No delegation, no lease */
7562         if (!nfs4_have_delegation(inode, type))
7563                 return -EAGAIN;
7564         ret = generic_setlease(file, arg, lease, priv);
7565         if (ret || nfs4_have_delegation(inode, type))
7566                 return ret;
7567         /* We raced with a delegation return */
7568         nfs4_delete_lease(file, priv);
7569         return -EAGAIN;
7570 }
7571
7572 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7573                        void **priv)
7574 {
7575         switch (arg) {
7576         case F_RDLCK:
7577         case F_WRLCK:
7578                 return nfs4_add_lease(file, arg, lease, priv);
7579         case F_UNLCK:
7580                 return nfs4_delete_lease(file, priv);
7581         default:
7582                 return -EINVAL;
7583         }
7584 }
7585
7586 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7587 {
7588         struct nfs_server *server = NFS_SERVER(state->inode);
7589         int err;
7590
7591         err = nfs4_set_lock_state(state, fl);
7592         if (err != 0)
7593                 return err;
7594         do {
7595                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7596                 if (err != -NFS4ERR_DELAY)
7597                         break;
7598                 ssleep(1);
7599         } while (err == -NFS4ERR_DELAY);
7600         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7601 }
7602
7603 struct nfs_release_lockowner_data {
7604         struct nfs4_lock_state *lsp;
7605         struct nfs_server *server;
7606         struct nfs_release_lockowner_args args;
7607         struct nfs_release_lockowner_res res;
7608         unsigned long timestamp;
7609 };
7610
7611 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7612 {
7613         struct nfs_release_lockowner_data *data = calldata;
7614         struct nfs_server *server = data->server;
7615         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7616                            &data->res.seq_res, task);
7617         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7618         data->timestamp = jiffies;
7619 }
7620
7621 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7622 {
7623         struct nfs_release_lockowner_data *data = calldata;
7624         struct nfs_server *server = data->server;
7625
7626         nfs40_sequence_done(task, &data->res.seq_res);
7627
7628         switch (task->tk_status) {
7629         case 0:
7630                 renew_lease(server, data->timestamp);
7631                 break;
7632         case -NFS4ERR_STALE_CLIENTID:
7633         case -NFS4ERR_EXPIRED:
7634                 nfs4_schedule_lease_recovery(server->nfs_client);
7635                 break;
7636         case -NFS4ERR_LEASE_MOVED:
7637         case -NFS4ERR_DELAY:
7638                 if (nfs4_async_handle_error(task, server,
7639                                             NULL, NULL) == -EAGAIN)
7640                         rpc_restart_call_prepare(task);
7641         }
7642 }
7643
7644 static void nfs4_release_lockowner_release(void *calldata)
7645 {
7646         struct nfs_release_lockowner_data *data = calldata;
7647         nfs4_free_lock_state(data->server, data->lsp);
7648         kfree(calldata);
7649 }
7650
7651 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7652         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7653         .rpc_call_done = nfs4_release_lockowner_done,
7654         .rpc_release = nfs4_release_lockowner_release,
7655 };
7656
7657 static void
7658 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7659 {
7660         struct nfs_release_lockowner_data *data;
7661         struct rpc_message msg = {
7662                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7663         };
7664
7665         if (server->nfs_client->cl_mvops->minor_version != 0)
7666                 return;
7667
7668         data = kmalloc(sizeof(*data), GFP_KERNEL);
7669         if (!data)
7670                 return;
7671         data->lsp = lsp;
7672         data->server = server;
7673         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7674         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7675         data->args.lock_owner.s_dev = server->s_dev;
7676
7677         msg.rpc_argp = &data->args;
7678         msg.rpc_resp = &data->res;
7679         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7680         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7681 }
7682
7683 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7684
7685 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7686                                    struct user_namespace *mnt_userns,
7687                                    struct dentry *unused, struct inode *inode,
7688                                    const char *key, const void *buf,
7689                                    size_t buflen, int flags)
7690 {
7691         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7692 }
7693
7694 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7695                                    struct dentry *unused, struct inode *inode,
7696                                    const char *key, void *buf, size_t buflen)
7697 {
7698         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7699 }
7700
7701 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7702 {
7703         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7704 }
7705
7706 #if defined(CONFIG_NFS_V4_1)
7707 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7708
7709 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7710                                     struct user_namespace *mnt_userns,
7711                                     struct dentry *unused, struct inode *inode,
7712                                     const char *key, const void *buf,
7713                                     size_t buflen, int flags)
7714 {
7715         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7716 }
7717
7718 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7719                                     struct dentry *unused, struct inode *inode,
7720                                     const char *key, void *buf, size_t buflen)
7721 {
7722         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7723 }
7724
7725 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7726 {
7727         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7728 }
7729
7730 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7731
7732 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7733                                     struct user_namespace *mnt_userns,
7734                                     struct dentry *unused, struct inode *inode,
7735                                     const char *key, const void *buf,
7736                                     size_t buflen, int flags)
7737 {
7738         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7739 }
7740
7741 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7742                                     struct dentry *unused, struct inode *inode,
7743                                     const char *key, void *buf, size_t buflen)
7744 {
7745         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7746 }
7747
7748 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7749 {
7750         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7751 }
7752
7753 #endif
7754
7755 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7756
7757 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7758                                      struct user_namespace *mnt_userns,
7759                                      struct dentry *unused, struct inode *inode,
7760                                      const char *key, const void *buf,
7761                                      size_t buflen, int flags)
7762 {
7763         if (security_ismaclabel(key))
7764                 return nfs4_set_security_label(inode, buf, buflen);
7765
7766         return -EOPNOTSUPP;
7767 }
7768
7769 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7770                                      struct dentry *unused, struct inode *inode,
7771                                      const char *key, void *buf, size_t buflen)
7772 {
7773         if (security_ismaclabel(key))
7774                 return nfs4_get_security_label(inode, buf, buflen);
7775         return -EOPNOTSUPP;
7776 }
7777
7778 static ssize_t
7779 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7780 {
7781         int len = 0;
7782
7783         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7784                 len = security_inode_listsecurity(inode, list, list_len);
7785                 if (len >= 0 && list_len && len > list_len)
7786                         return -ERANGE;
7787         }
7788         return len;
7789 }
7790
7791 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7792         .prefix = XATTR_SECURITY_PREFIX,
7793         .get    = nfs4_xattr_get_nfs4_label,
7794         .set    = nfs4_xattr_set_nfs4_label,
7795 };
7796
7797 #else
7798
7799 static ssize_t
7800 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7801 {
7802         return 0;
7803 }
7804
7805 #endif
7806
7807 #ifdef CONFIG_NFS_V4_2
7808 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7809                                     struct user_namespace *mnt_userns,
7810                                     struct dentry *unused, struct inode *inode,
7811                                     const char *key, const void *buf,
7812                                     size_t buflen, int flags)
7813 {
7814         u32 mask;
7815         int ret;
7816
7817         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7818                 return -EOPNOTSUPP;
7819
7820         /*
7821          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7822          * flags right now. Handling of xattr operations use the normal
7823          * file read/write permissions.
7824          *
7825          * Just in case the server has other ideas (which RFC 8276 allows),
7826          * do a cached access check for the XA* flags to possibly avoid
7827          * doing an RPC and getting EACCES back.
7828          */
7829         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7830                 if (!(mask & NFS_ACCESS_XAWRITE))
7831                         return -EACCES;
7832         }
7833
7834         if (buf == NULL) {
7835                 ret = nfs42_proc_removexattr(inode, key);
7836                 if (!ret)
7837                         nfs4_xattr_cache_remove(inode, key);
7838         } else {
7839                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7840                 if (!ret)
7841                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7842         }
7843
7844         return ret;
7845 }
7846
7847 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7848                                     struct dentry *unused, struct inode *inode,
7849                                     const char *key, void *buf, size_t buflen)
7850 {
7851         u32 mask;
7852         ssize_t ret;
7853
7854         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7855                 return -EOPNOTSUPP;
7856
7857         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7858                 if (!(mask & NFS_ACCESS_XAREAD))
7859                         return -EACCES;
7860         }
7861
7862         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7863         if (ret)
7864                 return ret;
7865
7866         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7867         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7868                 return ret;
7869
7870         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7871
7872         return ret;
7873 }
7874
7875 static ssize_t
7876 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7877 {
7878         u64 cookie;
7879         bool eof;
7880         ssize_t ret, size;
7881         char *buf;
7882         size_t buflen;
7883         u32 mask;
7884
7885         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7886                 return 0;
7887
7888         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7889                 if (!(mask & NFS_ACCESS_XALIST))
7890                         return 0;
7891         }
7892
7893         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7894         if (ret)
7895                 return ret;
7896
7897         ret = nfs4_xattr_cache_list(inode, list, list_len);
7898         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7899                 return ret;
7900
7901         cookie = 0;
7902         eof = false;
7903         buflen = list_len ? list_len : XATTR_LIST_MAX;
7904         buf = list_len ? list : NULL;
7905         size = 0;
7906
7907         while (!eof) {
7908                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7909                     &cookie, &eof);
7910                 if (ret < 0)
7911                         return ret;
7912
7913                 if (list_len) {
7914                         buf += ret;
7915                         buflen -= ret;
7916                 }
7917                 size += ret;
7918         }
7919
7920         if (list_len)
7921                 nfs4_xattr_cache_set_list(inode, list, size);
7922
7923         return size;
7924 }
7925
7926 #else
7927
7928 static ssize_t
7929 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7930 {
7931         return 0;
7932 }
7933 #endif /* CONFIG_NFS_V4_2 */
7934
7935 /*
7936  * nfs_fhget will use either the mounted_on_fileid or the fileid
7937  */
7938 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7939 {
7940         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7941                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7942               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7943               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7944                 return;
7945
7946         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7947                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7948         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7949         fattr->nlink = 2;
7950 }
7951
7952 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7953                                    const struct qstr *name,
7954                                    struct nfs4_fs_locations *fs_locations,
7955                                    struct page *page)
7956 {
7957         struct nfs_server *server = NFS_SERVER(dir);
7958         u32 bitmask[3];
7959         struct nfs4_fs_locations_arg args = {
7960                 .dir_fh = NFS_FH(dir),
7961                 .name = name,
7962                 .page = page,
7963                 .bitmask = bitmask,
7964         };
7965         struct nfs4_fs_locations_res res = {
7966                 .fs_locations = fs_locations,
7967         };
7968         struct rpc_message msg = {
7969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7970                 .rpc_argp = &args,
7971                 .rpc_resp = &res,
7972         };
7973         int status;
7974
7975         dprintk("%s: start\n", __func__);
7976
7977         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7978         bitmask[1] = nfs4_fattr_bitmap[1];
7979
7980         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7981          * is not supported */
7982         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7983                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7984         else
7985                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7986
7987         nfs_fattr_init(fs_locations->fattr);
7988         fs_locations->server = server;
7989         fs_locations->nlocations = 0;
7990         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7991         dprintk("%s: returned status = %d\n", __func__, status);
7992         return status;
7993 }
7994
7995 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7996                            const struct qstr *name,
7997                            struct nfs4_fs_locations *fs_locations,
7998                            struct page *page)
7999 {
8000         struct nfs4_exception exception = {
8001                 .interruptible = true,
8002         };
8003         int err;
8004         do {
8005                 err = _nfs4_proc_fs_locations(client, dir, name,
8006                                 fs_locations, page);
8007                 trace_nfs4_get_fs_locations(dir, name, err);
8008                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8009                                 &exception);
8010         } while (exception.retry);
8011         return err;
8012 }
8013
8014 /*
8015  * This operation also signals the server that this client is
8016  * performing migration recovery.  The server can stop returning
8017  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8018  * appended to this compound to identify the client ID which is
8019  * performing recovery.
8020  */
8021 static int _nfs40_proc_get_locations(struct nfs_server *server,
8022                                      struct nfs_fh *fhandle,
8023                                      struct nfs4_fs_locations *locations,
8024                                      struct page *page, const struct cred *cred)
8025 {
8026         struct rpc_clnt *clnt = server->client;
8027         u32 bitmask[2] = {
8028                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8029         };
8030         struct nfs4_fs_locations_arg args = {
8031                 .clientid       = server->nfs_client->cl_clientid,
8032                 .fh             = fhandle,
8033                 .page           = page,
8034                 .bitmask        = bitmask,
8035                 .migration      = 1,            /* skip LOOKUP */
8036                 .renew          = 1,            /* append RENEW */
8037         };
8038         struct nfs4_fs_locations_res res = {
8039                 .fs_locations   = locations,
8040                 .migration      = 1,
8041                 .renew          = 1,
8042         };
8043         struct rpc_message msg = {
8044                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8045                 .rpc_argp       = &args,
8046                 .rpc_resp       = &res,
8047                 .rpc_cred       = cred,
8048         };
8049         unsigned long now = jiffies;
8050         int status;
8051
8052         nfs_fattr_init(locations->fattr);
8053         locations->server = server;
8054         locations->nlocations = 0;
8055
8056         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8057         status = nfs4_call_sync_sequence(clnt, server, &msg,
8058                                         &args.seq_args, &res.seq_res);
8059         if (status)
8060                 return status;
8061
8062         renew_lease(server, now);
8063         return 0;
8064 }
8065
8066 #ifdef CONFIG_NFS_V4_1
8067
8068 /*
8069  * This operation also signals the server that this client is
8070  * performing migration recovery.  The server can stop asserting
8071  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8072  * performing this operation is identified in the SEQUENCE
8073  * operation in this compound.
8074  *
8075  * When the client supports GETATTR(fs_locations_info), it can
8076  * be plumbed in here.
8077  */
8078 static int _nfs41_proc_get_locations(struct nfs_server *server,
8079                                      struct nfs_fh *fhandle,
8080                                      struct nfs4_fs_locations *locations,
8081                                      struct page *page, const struct cred *cred)
8082 {
8083         struct rpc_clnt *clnt = server->client;
8084         u32 bitmask[2] = {
8085                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8086         };
8087         struct nfs4_fs_locations_arg args = {
8088                 .fh             = fhandle,
8089                 .page           = page,
8090                 .bitmask        = bitmask,
8091                 .migration      = 1,            /* skip LOOKUP */
8092         };
8093         struct nfs4_fs_locations_res res = {
8094                 .fs_locations   = locations,
8095                 .migration      = 1,
8096         };
8097         struct rpc_message msg = {
8098                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8099                 .rpc_argp       = &args,
8100                 .rpc_resp       = &res,
8101                 .rpc_cred       = cred,
8102         };
8103         struct nfs4_call_sync_data data = {
8104                 .seq_server = server,
8105                 .seq_args = &args.seq_args,
8106                 .seq_res = &res.seq_res,
8107         };
8108         struct rpc_task_setup task_setup_data = {
8109                 .rpc_client = clnt,
8110                 .rpc_message = &msg,
8111                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8112                 .callback_data = &data,
8113                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8114         };
8115         int status;
8116
8117         nfs_fattr_init(locations->fattr);
8118         locations->server = server;
8119         locations->nlocations = 0;
8120
8121         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8122         status = nfs4_call_sync_custom(&task_setup_data);
8123         if (status == NFS4_OK &&
8124             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8125                 status = -NFS4ERR_LEASE_MOVED;
8126         return status;
8127 }
8128
8129 #endif  /* CONFIG_NFS_V4_1 */
8130
8131 /**
8132  * nfs4_proc_get_locations - discover locations for a migrated FSID
8133  * @server: pointer to nfs_server to process
8134  * @fhandle: pointer to the kernel NFS client file handle
8135  * @locations: result of query
8136  * @page: buffer
8137  * @cred: credential to use for this operation
8138  *
8139  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8140  * operation failed, or a negative errno if a local error occurred.
8141  *
8142  * On success, "locations" is filled in, but if the server has
8143  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8144  * asserted.
8145  *
8146  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8147  * from this client that require migration recovery.
8148  */
8149 int nfs4_proc_get_locations(struct nfs_server *server,
8150                             struct nfs_fh *fhandle,
8151                             struct nfs4_fs_locations *locations,
8152                             struct page *page, const struct cred *cred)
8153 {
8154         struct nfs_client *clp = server->nfs_client;
8155         const struct nfs4_mig_recovery_ops *ops =
8156                                         clp->cl_mvops->mig_recovery_ops;
8157         struct nfs4_exception exception = {
8158                 .interruptible = true,
8159         };
8160         int status;
8161
8162         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8163                 (unsigned long long)server->fsid.major,
8164                 (unsigned long long)server->fsid.minor,
8165                 clp->cl_hostname);
8166         nfs_display_fhandle(fhandle, __func__);
8167
8168         do {
8169                 status = ops->get_locations(server, fhandle, locations, page,
8170                                             cred);
8171                 if (status != -NFS4ERR_DELAY)
8172                         break;
8173                 nfs4_handle_exception(server, status, &exception);
8174         } while (exception.retry);
8175         return status;
8176 }
8177
8178 /*
8179  * This operation also signals the server that this client is
8180  * performing "lease moved" recovery.  The server can stop
8181  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8182  * is appended to this compound to identify the client ID which is
8183  * performing recovery.
8184  */
8185 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8186 {
8187         struct nfs_server *server = NFS_SERVER(inode);
8188         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8189         struct rpc_clnt *clnt = server->client;
8190         struct nfs4_fsid_present_arg args = {
8191                 .fh             = NFS_FH(inode),
8192                 .clientid       = clp->cl_clientid,
8193                 .renew          = 1,            /* append RENEW */
8194         };
8195         struct nfs4_fsid_present_res res = {
8196                 .renew          = 1,
8197         };
8198         struct rpc_message msg = {
8199                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8200                 .rpc_argp       = &args,
8201                 .rpc_resp       = &res,
8202                 .rpc_cred       = cred,
8203         };
8204         unsigned long now = jiffies;
8205         int status;
8206
8207         res.fh = nfs_alloc_fhandle();
8208         if (res.fh == NULL)
8209                 return -ENOMEM;
8210
8211         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8212         status = nfs4_call_sync_sequence(clnt, server, &msg,
8213                                                 &args.seq_args, &res.seq_res);
8214         nfs_free_fhandle(res.fh);
8215         if (status)
8216                 return status;
8217
8218         do_renew_lease(clp, now);
8219         return 0;
8220 }
8221
8222 #ifdef CONFIG_NFS_V4_1
8223
8224 /*
8225  * This operation also signals the server that this client is
8226  * performing "lease moved" recovery.  The server can stop asserting
8227  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8228  * this operation is identified in the SEQUENCE operation in this
8229  * compound.
8230  */
8231 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8232 {
8233         struct nfs_server *server = NFS_SERVER(inode);
8234         struct rpc_clnt *clnt = server->client;
8235         struct nfs4_fsid_present_arg args = {
8236                 .fh             = NFS_FH(inode),
8237         };
8238         struct nfs4_fsid_present_res res = {
8239         };
8240         struct rpc_message msg = {
8241                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8242                 .rpc_argp       = &args,
8243                 .rpc_resp       = &res,
8244                 .rpc_cred       = cred,
8245         };
8246         int status;
8247
8248         res.fh = nfs_alloc_fhandle();
8249         if (res.fh == NULL)
8250                 return -ENOMEM;
8251
8252         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8253         status = nfs4_call_sync_sequence(clnt, server, &msg,
8254                                                 &args.seq_args, &res.seq_res);
8255         nfs_free_fhandle(res.fh);
8256         if (status == NFS4_OK &&
8257             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8258                 status = -NFS4ERR_LEASE_MOVED;
8259         return status;
8260 }
8261
8262 #endif  /* CONFIG_NFS_V4_1 */
8263
8264 /**
8265  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8266  * @inode: inode on FSID to check
8267  * @cred: credential to use for this operation
8268  *
8269  * Server indicates whether the FSID is present, moved, or not
8270  * recognized.  This operation is necessary to clear a LEASE_MOVED
8271  * condition for this client ID.
8272  *
8273  * Returns NFS4_OK if the FSID is present on this server,
8274  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8275  *  NFS4ERR code if some error occurred on the server, or a
8276  *  negative errno if a local failure occurred.
8277  */
8278 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8279 {
8280         struct nfs_server *server = NFS_SERVER(inode);
8281         struct nfs_client *clp = server->nfs_client;
8282         const struct nfs4_mig_recovery_ops *ops =
8283                                         clp->cl_mvops->mig_recovery_ops;
8284         struct nfs4_exception exception = {
8285                 .interruptible = true,
8286         };
8287         int status;
8288
8289         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8290                 (unsigned long long)server->fsid.major,
8291                 (unsigned long long)server->fsid.minor,
8292                 clp->cl_hostname);
8293         nfs_display_fhandle(NFS_FH(inode), __func__);
8294
8295         do {
8296                 status = ops->fsid_present(inode, cred);
8297                 if (status != -NFS4ERR_DELAY)
8298                         break;
8299                 nfs4_handle_exception(server, status, &exception);
8300         } while (exception.retry);
8301         return status;
8302 }
8303
8304 /*
8305  * If 'use_integrity' is true and the state managment nfs_client
8306  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8307  * and the machine credential as per RFC3530bis and RFC5661 Security
8308  * Considerations sections. Otherwise, just use the user cred with the
8309  * filesystem's rpc_client.
8310  */
8311 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8312 {
8313         int status;
8314         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8315         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8316         struct nfs4_secinfo_arg args = {
8317                 .dir_fh = NFS_FH(dir),
8318                 .name   = name,
8319         };
8320         struct nfs4_secinfo_res res = {
8321                 .flavors     = flavors,
8322         };
8323         struct rpc_message msg = {
8324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8325                 .rpc_argp = &args,
8326                 .rpc_resp = &res,
8327         };
8328         struct nfs4_call_sync_data data = {
8329                 .seq_server = NFS_SERVER(dir),
8330                 .seq_args = &args.seq_args,
8331                 .seq_res = &res.seq_res,
8332         };
8333         struct rpc_task_setup task_setup = {
8334                 .rpc_client = clnt,
8335                 .rpc_message = &msg,
8336                 .callback_ops = clp->cl_mvops->call_sync_ops,
8337                 .callback_data = &data,
8338                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8339         };
8340         const struct cred *cred = NULL;
8341
8342         if (use_integrity) {
8343                 clnt = clp->cl_rpcclient;
8344                 task_setup.rpc_client = clnt;
8345
8346                 cred = nfs4_get_clid_cred(clp);
8347                 msg.rpc_cred = cred;
8348         }
8349
8350         dprintk("NFS call  secinfo %s\n", name->name);
8351
8352         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8353         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8354         status = nfs4_call_sync_custom(&task_setup);
8355
8356         dprintk("NFS reply  secinfo: %d\n", status);
8357
8358         put_cred(cred);
8359         return status;
8360 }
8361
8362 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8363                       struct nfs4_secinfo_flavors *flavors)
8364 {
8365         struct nfs4_exception exception = {
8366                 .interruptible = true,
8367         };
8368         int err;
8369         do {
8370                 err = -NFS4ERR_WRONGSEC;
8371
8372                 /* try to use integrity protection with machine cred */
8373                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8374                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8375
8376                 /*
8377                  * if unable to use integrity protection, or SECINFO with
8378                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8379                  * disallowed by spec, but exists in deployed servers) use
8380                  * the current filesystem's rpc_client and the user cred.
8381                  */
8382                 if (err == -NFS4ERR_WRONGSEC)
8383                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8384
8385                 trace_nfs4_secinfo(dir, name, err);
8386                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8387                                 &exception);
8388         } while (exception.retry);
8389         return err;
8390 }
8391
8392 #ifdef CONFIG_NFS_V4_1
8393 /*
8394  * Check the exchange flags returned by the server for invalid flags, having
8395  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8396  * DS flags set.
8397  */
8398 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8399 {
8400         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8401                 goto out_inval;
8402         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8403                 goto out_inval;
8404         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8405             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8406                 goto out_inval;
8407         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8408                 goto out_inval;
8409         return NFS_OK;
8410 out_inval:
8411         return -NFS4ERR_INVAL;
8412 }
8413
8414 static bool
8415 nfs41_same_server_scope(struct nfs41_server_scope *a,
8416                         struct nfs41_server_scope *b)
8417 {
8418         if (a->server_scope_sz != b->server_scope_sz)
8419                 return false;
8420         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8421 }
8422
8423 static void
8424 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8425 {
8426         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8427         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8428         struct nfs_client *clp = args->client;
8429
8430         switch (task->tk_status) {
8431         case -NFS4ERR_BADSESSION:
8432         case -NFS4ERR_DEADSESSION:
8433                 nfs4_schedule_session_recovery(clp->cl_session,
8434                                 task->tk_status);
8435                 return;
8436         }
8437         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8438                         res->dir != NFS4_CDFS4_BOTH) {
8439                 rpc_task_close_connection(task);
8440                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8441                         rpc_restart_call(task);
8442         }
8443 }
8444
8445 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8446         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8447 };
8448
8449 /*
8450  * nfs4_proc_bind_one_conn_to_session()
8451  *
8452  * The 4.1 client currently uses the same TCP connection for the
8453  * fore and backchannel.
8454  */
8455 static
8456 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8457                 struct rpc_xprt *xprt,
8458                 struct nfs_client *clp,
8459                 const struct cred *cred)
8460 {
8461         int status;
8462         struct nfs41_bind_conn_to_session_args args = {
8463                 .client = clp,
8464                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8465                 .retries = 0,
8466         };
8467         struct nfs41_bind_conn_to_session_res res;
8468         struct rpc_message msg = {
8469                 .rpc_proc =
8470                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8471                 .rpc_argp = &args,
8472                 .rpc_resp = &res,
8473                 .rpc_cred = cred,
8474         };
8475         struct rpc_task_setup task_setup_data = {
8476                 .rpc_client = clnt,
8477                 .rpc_xprt = xprt,
8478                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8479                 .rpc_message = &msg,
8480                 .flags = RPC_TASK_TIMEOUT,
8481         };
8482         struct rpc_task *task;
8483
8484         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8485         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8486                 args.dir = NFS4_CDFC4_FORE;
8487
8488         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8489         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8490                 args.dir = NFS4_CDFC4_FORE;
8491
8492         task = rpc_run_task(&task_setup_data);
8493         if (!IS_ERR(task)) {
8494                 status = task->tk_status;
8495                 rpc_put_task(task);
8496         } else
8497                 status = PTR_ERR(task);
8498         trace_nfs4_bind_conn_to_session(clp, status);
8499         if (status == 0) {
8500                 if (memcmp(res.sessionid.data,
8501                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8502                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8503                         return -EIO;
8504                 }
8505                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8506                         dprintk("NFS: %s: Unexpected direction from server\n",
8507                                 __func__);
8508                         return -EIO;
8509                 }
8510                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8511                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8512                                 __func__);
8513                         return -EIO;
8514                 }
8515         }
8516
8517         return status;
8518 }
8519
8520 struct rpc_bind_conn_calldata {
8521         struct nfs_client *clp;
8522         const struct cred *cred;
8523 };
8524
8525 static int
8526 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8527                 struct rpc_xprt *xprt,
8528                 void *calldata)
8529 {
8530         struct rpc_bind_conn_calldata *p = calldata;
8531
8532         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8533 }
8534
8535 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8536 {
8537         struct rpc_bind_conn_calldata data = {
8538                 .clp = clp,
8539                 .cred = cred,
8540         };
8541         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8542                         nfs4_proc_bind_conn_to_session_callback, &data);
8543 }
8544
8545 /*
8546  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8547  * and operations we'd like to see to enable certain features in the allow map
8548  */
8549 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8550         .how = SP4_MACH_CRED,
8551         .enforce.u.words = {
8552                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8553                       1 << (OP_EXCHANGE_ID - 32) |
8554                       1 << (OP_CREATE_SESSION - 32) |
8555                       1 << (OP_DESTROY_SESSION - 32) |
8556                       1 << (OP_DESTROY_CLIENTID - 32)
8557         },
8558         .allow.u.words = {
8559                 [0] = 1 << (OP_CLOSE) |
8560                       1 << (OP_OPEN_DOWNGRADE) |
8561                       1 << (OP_LOCKU) |
8562                       1 << (OP_DELEGRETURN) |
8563                       1 << (OP_COMMIT),
8564                 [1] = 1 << (OP_SECINFO - 32) |
8565                       1 << (OP_SECINFO_NO_NAME - 32) |
8566                       1 << (OP_LAYOUTRETURN - 32) |
8567                       1 << (OP_TEST_STATEID - 32) |
8568                       1 << (OP_FREE_STATEID - 32) |
8569                       1 << (OP_WRITE - 32)
8570         }
8571 };
8572
8573 /*
8574  * Select the state protection mode for client `clp' given the server results
8575  * from exchange_id in `sp'.
8576  *
8577  * Returns 0 on success, negative errno otherwise.
8578  */
8579 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8580                                  struct nfs41_state_protection *sp)
8581 {
8582         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8583                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8584                       1 << (OP_EXCHANGE_ID - 32) |
8585                       1 << (OP_CREATE_SESSION - 32) |
8586                       1 << (OP_DESTROY_SESSION - 32) |
8587                       1 << (OP_DESTROY_CLIENTID - 32)
8588         };
8589         unsigned long flags = 0;
8590         unsigned int i;
8591         int ret = 0;
8592
8593         if (sp->how == SP4_MACH_CRED) {
8594                 /* Print state protect result */
8595                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8596                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8597                         if (test_bit(i, sp->enforce.u.longs))
8598                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8599                         if (test_bit(i, sp->allow.u.longs))
8600                                 dfprintk(MOUNT, "  allow op %d\n", i);
8601                 }
8602
8603                 /* make sure nothing is on enforce list that isn't supported */
8604                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8605                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8606                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8607                                 ret = -EINVAL;
8608                                 goto out;
8609                         }
8610                 }
8611
8612                 /*
8613                  * Minimal mode - state operations are allowed to use machine
8614                  * credential.  Note this already happens by default, so the
8615                  * client doesn't have to do anything more than the negotiation.
8616                  *
8617                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8618                  *       we're already using the machine cred for exchange_id
8619                  *       and will never use a different cred.
8620                  */
8621                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8622                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8623                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8624                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8625                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8626                         dfprintk(MOUNT, "  minimal mode enabled\n");
8627                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8628                 } else {
8629                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8630                         ret = -EINVAL;
8631                         goto out;
8632                 }
8633
8634                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8635                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8636                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8637                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8638                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8639                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8640                 }
8641
8642                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8643                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8644                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8645                 }
8646
8647                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8648                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8649                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8650                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8651                 }
8652
8653                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8654                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8655                         dfprintk(MOUNT, "  stateid mode enabled\n");
8656                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8657                 }
8658
8659                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8660                         dfprintk(MOUNT, "  write mode enabled\n");
8661                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8662                 }
8663
8664                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8665                         dfprintk(MOUNT, "  commit mode enabled\n");
8666                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8667                 }
8668         }
8669 out:
8670         clp->cl_sp4_flags = flags;
8671         return ret;
8672 }
8673
8674 struct nfs41_exchange_id_data {
8675         struct nfs41_exchange_id_res res;
8676         struct nfs41_exchange_id_args args;
8677 };
8678
8679 static void nfs4_exchange_id_release(void *data)
8680 {
8681         struct nfs41_exchange_id_data *cdata =
8682                                         (struct nfs41_exchange_id_data *)data;
8683
8684         nfs_put_client(cdata->args.client);
8685         kfree(cdata->res.impl_id);
8686         kfree(cdata->res.server_scope);
8687         kfree(cdata->res.server_owner);
8688         kfree(cdata);
8689 }
8690
8691 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8692         .rpc_release = nfs4_exchange_id_release,
8693 };
8694
8695 /*
8696  * _nfs4_proc_exchange_id()
8697  *
8698  * Wrapper for EXCHANGE_ID operation.
8699  */
8700 static struct rpc_task *
8701 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8702                         u32 sp4_how, struct rpc_xprt *xprt)
8703 {
8704         struct rpc_message msg = {
8705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8706                 .rpc_cred = cred,
8707         };
8708         struct rpc_task_setup task_setup_data = {
8709                 .rpc_client = clp->cl_rpcclient,
8710                 .callback_ops = &nfs4_exchange_id_call_ops,
8711                 .rpc_message = &msg,
8712                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8713         };
8714         struct nfs41_exchange_id_data *calldata;
8715         int status;
8716
8717         if (!refcount_inc_not_zero(&clp->cl_count))
8718                 return ERR_PTR(-EIO);
8719
8720         status = -ENOMEM;
8721         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8722         if (!calldata)
8723                 goto out;
8724
8725         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8726
8727         status = nfs4_init_uniform_client_string(clp);
8728         if (status)
8729                 goto out_calldata;
8730
8731         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8732                                                 GFP_NOFS);
8733         status = -ENOMEM;
8734         if (unlikely(calldata->res.server_owner == NULL))
8735                 goto out_calldata;
8736
8737         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8738                                         GFP_NOFS);
8739         if (unlikely(calldata->res.server_scope == NULL))
8740                 goto out_server_owner;
8741
8742         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8743         if (unlikely(calldata->res.impl_id == NULL))
8744                 goto out_server_scope;
8745
8746         switch (sp4_how) {
8747         case SP4_NONE:
8748                 calldata->args.state_protect.how = SP4_NONE;
8749                 break;
8750
8751         case SP4_MACH_CRED:
8752                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8753                 break;
8754
8755         default:
8756                 /* unsupported! */
8757                 WARN_ON_ONCE(1);
8758                 status = -EINVAL;
8759                 goto out_impl_id;
8760         }
8761         if (xprt) {
8762                 task_setup_data.rpc_xprt = xprt;
8763                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8764                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8765                                 sizeof(calldata->args.verifier.data));
8766         }
8767         calldata->args.client = clp;
8768         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8769         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8770 #ifdef CONFIG_NFS_V4_1_MIGRATION
8771         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8772 #endif
8773         msg.rpc_argp = &calldata->args;
8774         msg.rpc_resp = &calldata->res;
8775         task_setup_data.callback_data = calldata;
8776
8777         return rpc_run_task(&task_setup_data);
8778
8779 out_impl_id:
8780         kfree(calldata->res.impl_id);
8781 out_server_scope:
8782         kfree(calldata->res.server_scope);
8783 out_server_owner:
8784         kfree(calldata->res.server_owner);
8785 out_calldata:
8786         kfree(calldata);
8787 out:
8788         nfs_put_client(clp);
8789         return ERR_PTR(status);
8790 }
8791
8792 /*
8793  * _nfs4_proc_exchange_id()
8794  *
8795  * Wrapper for EXCHANGE_ID operation.
8796  */
8797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8798                         u32 sp4_how)
8799 {
8800         struct rpc_task *task;
8801         struct nfs41_exchange_id_args *argp;
8802         struct nfs41_exchange_id_res *resp;
8803         unsigned long now = jiffies;
8804         int status;
8805
8806         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8807         if (IS_ERR(task))
8808                 return PTR_ERR(task);
8809
8810         argp = task->tk_msg.rpc_argp;
8811         resp = task->tk_msg.rpc_resp;
8812         status = task->tk_status;
8813         if (status  != 0)
8814                 goto out;
8815
8816         status = nfs4_check_cl_exchange_flags(resp->flags,
8817                         clp->cl_mvops->minor_version);
8818         if (status  != 0)
8819                 goto out;
8820
8821         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8822         if (status != 0)
8823                 goto out;
8824
8825         do_renew_lease(clp, now);
8826
8827         clp->cl_clientid = resp->clientid;
8828         clp->cl_exchange_flags = resp->flags;
8829         clp->cl_seqid = resp->seqid;
8830         /* Client ID is not confirmed */
8831         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8832                 clear_bit(NFS4_SESSION_ESTABLISHED,
8833                           &clp->cl_session->session_state);
8834
8835         if (clp->cl_serverscope != NULL &&
8836             !nfs41_same_server_scope(clp->cl_serverscope,
8837                                 resp->server_scope)) {
8838                 dprintk("%s: server_scope mismatch detected\n",
8839                         __func__);
8840                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8841         }
8842
8843         swap(clp->cl_serverowner, resp->server_owner);
8844         swap(clp->cl_serverscope, resp->server_scope);
8845         swap(clp->cl_implid, resp->impl_id);
8846
8847         /* Save the EXCHANGE_ID verifier session trunk tests */
8848         memcpy(clp->cl_confirm.data, argp->verifier.data,
8849                sizeof(clp->cl_confirm.data));
8850 out:
8851         trace_nfs4_exchange_id(clp, status);
8852         rpc_put_task(task);
8853         return status;
8854 }
8855
8856 /*
8857  * nfs4_proc_exchange_id()
8858  *
8859  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8860  *
8861  * Since the clientid has expired, all compounds using sessions
8862  * associated with the stale clientid will be returning
8863  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8864  * be in some phase of session reset.
8865  *
8866  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8867  */
8868 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8869 {
8870         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8871         int status;
8872
8873         /* try SP4_MACH_CRED if krb5i/p */
8874         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8875             authflavor == RPC_AUTH_GSS_KRB5P) {
8876                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8877                 if (!status)
8878                         return 0;
8879         }
8880
8881         /* try SP4_NONE */
8882         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8883 }
8884
8885 /**
8886  * nfs4_test_session_trunk
8887  *
8888  * This is an add_xprt_test() test function called from
8889  * rpc_clnt_setup_test_and_add_xprt.
8890  *
8891  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8892  * and is dereferrenced in nfs4_exchange_id_release
8893  *
8894  * Upon success, add the new transport to the rpc_clnt
8895  *
8896  * @clnt: struct rpc_clnt to get new transport
8897  * @xprt: the rpc_xprt to test
8898  * @data: call data for _nfs4_proc_exchange_id.
8899  */
8900 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8901                             void *data)
8902 {
8903         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8904         struct rpc_task *task;
8905         int status;
8906
8907         u32 sp4_how;
8908
8909         dprintk("--> %s try %s\n", __func__,
8910                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8911
8912         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8913
8914         /* Test connection for session trunking. Async exchange_id call */
8915         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8916         if (IS_ERR(task))
8917                 return;
8918
8919         status = task->tk_status;
8920         if (status == 0)
8921                 status = nfs4_detect_session_trunking(adata->clp,
8922                                 task->tk_msg.rpc_resp, xprt);
8923
8924         if (status == 0)
8925                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8926         else if (rpc_clnt_xprt_switch_has_addr(clnt,
8927                                 (struct sockaddr *)&xprt->addr))
8928                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8929
8930         rpc_put_task(task);
8931 }
8932 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8933
8934 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8935                 const struct cred *cred)
8936 {
8937         struct rpc_message msg = {
8938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8939                 .rpc_argp = clp,
8940                 .rpc_cred = cred,
8941         };
8942         int status;
8943
8944         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8945                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8946         trace_nfs4_destroy_clientid(clp, status);
8947         if (status)
8948                 dprintk("NFS: Got error %d from the server %s on "
8949                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8950         return status;
8951 }
8952
8953 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8954                 const struct cred *cred)
8955 {
8956         unsigned int loop;
8957         int ret;
8958
8959         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8960                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8961                 switch (ret) {
8962                 case -NFS4ERR_DELAY:
8963                 case -NFS4ERR_CLIENTID_BUSY:
8964                         ssleep(1);
8965                         break;
8966                 default:
8967                         return ret;
8968                 }
8969         }
8970         return 0;
8971 }
8972
8973 int nfs4_destroy_clientid(struct nfs_client *clp)
8974 {
8975         const struct cred *cred;
8976         int ret = 0;
8977
8978         if (clp->cl_mvops->minor_version < 1)
8979                 goto out;
8980         if (clp->cl_exchange_flags == 0)
8981                 goto out;
8982         if (clp->cl_preserve_clid)
8983                 goto out;
8984         cred = nfs4_get_clid_cred(clp);
8985         ret = nfs4_proc_destroy_clientid(clp, cred);
8986         put_cred(cred);
8987         switch (ret) {
8988         case 0:
8989         case -NFS4ERR_STALE_CLIENTID:
8990                 clp->cl_exchange_flags = 0;
8991         }
8992 out:
8993         return ret;
8994 }
8995
8996 #endif /* CONFIG_NFS_V4_1 */
8997
8998 struct nfs4_get_lease_time_data {
8999         struct nfs4_get_lease_time_args *args;
9000         struct nfs4_get_lease_time_res *res;
9001         struct nfs_client *clp;
9002 };
9003
9004 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9005                                         void *calldata)
9006 {
9007         struct nfs4_get_lease_time_data *data =
9008                         (struct nfs4_get_lease_time_data *)calldata;
9009
9010         /* just setup sequence, do not trigger session recovery
9011            since we're invoked within one */
9012         nfs4_setup_sequence(data->clp,
9013                         &data->args->la_seq_args,
9014                         &data->res->lr_seq_res,
9015                         task);
9016 }
9017
9018 /*
9019  * Called from nfs4_state_manager thread for session setup, so don't recover
9020  * from sequence operation or clientid errors.
9021  */
9022 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9023 {
9024         struct nfs4_get_lease_time_data *data =
9025                         (struct nfs4_get_lease_time_data *)calldata;
9026
9027         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9028                 return;
9029         switch (task->tk_status) {
9030         case -NFS4ERR_DELAY:
9031         case -NFS4ERR_GRACE:
9032                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9033                 task->tk_status = 0;
9034                 fallthrough;
9035         case -NFS4ERR_RETRY_UNCACHED_REP:
9036                 rpc_restart_call_prepare(task);
9037                 return;
9038         }
9039 }
9040
9041 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9042         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9043         .rpc_call_done = nfs4_get_lease_time_done,
9044 };
9045
9046 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9047 {
9048         struct nfs4_get_lease_time_args args;
9049         struct nfs4_get_lease_time_res res = {
9050                 .lr_fsinfo = fsinfo,
9051         };
9052         struct nfs4_get_lease_time_data data = {
9053                 .args = &args,
9054                 .res = &res,
9055                 .clp = clp,
9056         };
9057         struct rpc_message msg = {
9058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9059                 .rpc_argp = &args,
9060                 .rpc_resp = &res,
9061         };
9062         struct rpc_task_setup task_setup = {
9063                 .rpc_client = clp->cl_rpcclient,
9064                 .rpc_message = &msg,
9065                 .callback_ops = &nfs4_get_lease_time_ops,
9066                 .callback_data = &data,
9067                 .flags = RPC_TASK_TIMEOUT,
9068         };
9069
9070         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9071         return nfs4_call_sync_custom(&task_setup);
9072 }
9073
9074 #ifdef CONFIG_NFS_V4_1
9075
9076 /*
9077  * Initialize the values to be used by the client in CREATE_SESSION
9078  * If nfs4_init_session set the fore channel request and response sizes,
9079  * use them.
9080  *
9081  * Set the back channel max_resp_sz_cached to zero to force the client to
9082  * always set csa_cachethis to FALSE because the current implementation
9083  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9084  */
9085 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9086                                     struct rpc_clnt *clnt)
9087 {
9088         unsigned int max_rqst_sz, max_resp_sz;
9089         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9090         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9091
9092         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9093         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9094
9095         /* Fore channel attributes */
9096         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9097         args->fc_attrs.max_resp_sz = max_resp_sz;
9098         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9099         args->fc_attrs.max_reqs = max_session_slots;
9100
9101         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9102                 "max_ops=%u max_reqs=%u\n",
9103                 __func__,
9104                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9105                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9106
9107         /* Back channel attributes */
9108         args->bc_attrs.max_rqst_sz = max_bc_payload;
9109         args->bc_attrs.max_resp_sz = max_bc_payload;
9110         args->bc_attrs.max_resp_sz_cached = 0;
9111         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9112         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9113         if (args->bc_attrs.max_reqs > max_bc_slots)
9114                 args->bc_attrs.max_reqs = max_bc_slots;
9115
9116         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9117                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9118                 __func__,
9119                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9120                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9121                 args->bc_attrs.max_reqs);
9122 }
9123
9124 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9125                 struct nfs41_create_session_res *res)
9126 {
9127         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9128         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9129
9130         if (rcvd->max_resp_sz > sent->max_resp_sz)
9131                 return -EINVAL;
9132         /*
9133          * Our requested max_ops is the minimum we need; we're not
9134          * prepared to break up compounds into smaller pieces than that.
9135          * So, no point even trying to continue if the server won't
9136          * cooperate:
9137          */
9138         if (rcvd->max_ops < sent->max_ops)
9139                 return -EINVAL;
9140         if (rcvd->max_reqs == 0)
9141                 return -EINVAL;
9142         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9143                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9144         return 0;
9145 }
9146
9147 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9148                 struct nfs41_create_session_res *res)
9149 {
9150         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9151         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9152
9153         if (!(res->flags & SESSION4_BACK_CHAN))
9154                 goto out;
9155         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9156                 return -EINVAL;
9157         if (rcvd->max_resp_sz < sent->max_resp_sz)
9158                 return -EINVAL;
9159         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9160                 return -EINVAL;
9161         if (rcvd->max_ops > sent->max_ops)
9162                 return -EINVAL;
9163         if (rcvd->max_reqs > sent->max_reqs)
9164                 return -EINVAL;
9165 out:
9166         return 0;
9167 }
9168
9169 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9170                                      struct nfs41_create_session_res *res)
9171 {
9172         int ret;
9173
9174         ret = nfs4_verify_fore_channel_attrs(args, res);
9175         if (ret)
9176                 return ret;
9177         return nfs4_verify_back_channel_attrs(args, res);
9178 }
9179
9180 static void nfs4_update_session(struct nfs4_session *session,
9181                 struct nfs41_create_session_res *res)
9182 {
9183         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9184         /* Mark client id and session as being confirmed */
9185         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9186         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9187         session->flags = res->flags;
9188         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9189         if (res->flags & SESSION4_BACK_CHAN)
9190                 memcpy(&session->bc_attrs, &res->bc_attrs,
9191                                 sizeof(session->bc_attrs));
9192 }
9193
9194 static int _nfs4_proc_create_session(struct nfs_client *clp,
9195                 const struct cred *cred)
9196 {
9197         struct nfs4_session *session = clp->cl_session;
9198         struct nfs41_create_session_args args = {
9199                 .client = clp,
9200                 .clientid = clp->cl_clientid,
9201                 .seqid = clp->cl_seqid,
9202                 .cb_program = NFS4_CALLBACK,
9203         };
9204         struct nfs41_create_session_res res;
9205
9206         struct rpc_message msg = {
9207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9208                 .rpc_argp = &args,
9209                 .rpc_resp = &res,
9210                 .rpc_cred = cred,
9211         };
9212         int status;
9213
9214         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9215         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9216
9217         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9218                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9219         trace_nfs4_create_session(clp, status);
9220
9221         switch (status) {
9222         case -NFS4ERR_STALE_CLIENTID:
9223         case -NFS4ERR_DELAY:
9224         case -ETIMEDOUT:
9225         case -EACCES:
9226         case -EAGAIN:
9227                 goto out;
9228         }
9229
9230         clp->cl_seqid++;
9231         if (!status) {
9232                 /* Verify the session's negotiated channel_attrs values */
9233                 status = nfs4_verify_channel_attrs(&args, &res);
9234                 /* Increment the clientid slot sequence id */
9235                 if (status)
9236                         goto out;
9237                 nfs4_update_session(session, &res);
9238         }
9239 out:
9240         return status;
9241 }
9242
9243 /*
9244  * Issues a CREATE_SESSION operation to the server.
9245  * It is the responsibility of the caller to verify the session is
9246  * expired before calling this routine.
9247  */
9248 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9249 {
9250         int status;
9251         unsigned *ptr;
9252         struct nfs4_session *session = clp->cl_session;
9253         struct nfs4_add_xprt_data xprtdata = {
9254                 .clp = clp,
9255         };
9256         struct rpc_add_xprt_test rpcdata = {
9257                 .add_xprt_test = clp->cl_mvops->session_trunk,
9258                 .data = &xprtdata,
9259         };
9260
9261         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9262
9263         status = _nfs4_proc_create_session(clp, cred);
9264         if (status)
9265                 goto out;
9266
9267         /* Init or reset the session slot tables */
9268         status = nfs4_setup_session_slot_tables(session);
9269         dprintk("slot table setup returned %d\n", status);
9270         if (status)
9271                 goto out;
9272
9273         ptr = (unsigned *)&session->sess_id.data[0];
9274         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9275                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9276         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9277 out:
9278         return status;
9279 }
9280
9281 /*
9282  * Issue the over-the-wire RPC DESTROY_SESSION.
9283  * The caller must serialize access to this routine.
9284  */
9285 int nfs4_proc_destroy_session(struct nfs4_session *session,
9286                 const struct cred *cred)
9287 {
9288         struct rpc_message msg = {
9289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9290                 .rpc_argp = session,
9291                 .rpc_cred = cred,
9292         };
9293         int status = 0;
9294
9295         /* session is still being setup */
9296         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9297                 return 0;
9298
9299         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9300                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9301         trace_nfs4_destroy_session(session->clp, status);
9302
9303         if (status)
9304                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9305                         "Session has been destroyed regardless...\n", status);
9306         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9307         return status;
9308 }
9309
9310 /*
9311  * Renew the cl_session lease.
9312  */
9313 struct nfs4_sequence_data {
9314         struct nfs_client *clp;
9315         struct nfs4_sequence_args args;
9316         struct nfs4_sequence_res res;
9317 };
9318
9319 static void nfs41_sequence_release(void *data)
9320 {
9321         struct nfs4_sequence_data *calldata = data;
9322         struct nfs_client *clp = calldata->clp;
9323
9324         if (refcount_read(&clp->cl_count) > 1)
9325                 nfs4_schedule_state_renewal(clp);
9326         nfs_put_client(clp);
9327         kfree(calldata);
9328 }
9329
9330 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9331 {
9332         switch(task->tk_status) {
9333         case -NFS4ERR_DELAY:
9334                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9335                 return -EAGAIN;
9336         default:
9337                 nfs4_schedule_lease_recovery(clp);
9338         }
9339         return 0;
9340 }
9341
9342 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9343 {
9344         struct nfs4_sequence_data *calldata = data;
9345         struct nfs_client *clp = calldata->clp;
9346
9347         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9348                 return;
9349
9350         trace_nfs4_sequence(clp, task->tk_status);
9351         if (task->tk_status < 0) {
9352                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9353                 if (refcount_read(&clp->cl_count) == 1)
9354                         return;
9355
9356                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9357                         rpc_restart_call_prepare(task);
9358                         return;
9359                 }
9360         }
9361         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9362 }
9363
9364 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9365 {
9366         struct nfs4_sequence_data *calldata = data;
9367         struct nfs_client *clp = calldata->clp;
9368         struct nfs4_sequence_args *args;
9369         struct nfs4_sequence_res *res;
9370
9371         args = task->tk_msg.rpc_argp;
9372         res = task->tk_msg.rpc_resp;
9373
9374         nfs4_setup_sequence(clp, args, res, task);
9375 }
9376
9377 static const struct rpc_call_ops nfs41_sequence_ops = {
9378         .rpc_call_done = nfs41_sequence_call_done,
9379         .rpc_call_prepare = nfs41_sequence_prepare,
9380         .rpc_release = nfs41_sequence_release,
9381 };
9382
9383 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9384                 const struct cred *cred,
9385                 struct nfs4_slot *slot,
9386                 bool is_privileged)
9387 {
9388         struct nfs4_sequence_data *calldata;
9389         struct rpc_message msg = {
9390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9391                 .rpc_cred = cred,
9392         };
9393         struct rpc_task_setup task_setup_data = {
9394                 .rpc_client = clp->cl_rpcclient,
9395                 .rpc_message = &msg,
9396                 .callback_ops = &nfs41_sequence_ops,
9397                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9398         };
9399         struct rpc_task *ret;
9400
9401         ret = ERR_PTR(-EIO);
9402         if (!refcount_inc_not_zero(&clp->cl_count))
9403                 goto out_err;
9404
9405         ret = ERR_PTR(-ENOMEM);
9406         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9407         if (calldata == NULL)
9408                 goto out_put_clp;
9409         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9410         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9411         msg.rpc_argp = &calldata->args;
9412         msg.rpc_resp = &calldata->res;
9413         calldata->clp = clp;
9414         task_setup_data.callback_data = calldata;
9415
9416         ret = rpc_run_task(&task_setup_data);
9417         if (IS_ERR(ret))
9418                 goto out_err;
9419         return ret;
9420 out_put_clp:
9421         nfs_put_client(clp);
9422 out_err:
9423         nfs41_release_slot(slot);
9424         return ret;
9425 }
9426
9427 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9428 {
9429         struct rpc_task *task;
9430         int ret = 0;
9431
9432         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9433                 return -EAGAIN;
9434         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9435         if (IS_ERR(task))
9436                 ret = PTR_ERR(task);
9437         else
9438                 rpc_put_task_async(task);
9439         dprintk("<-- %s status=%d\n", __func__, ret);
9440         return ret;
9441 }
9442
9443 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9444 {
9445         struct rpc_task *task;
9446         int ret;
9447
9448         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9449         if (IS_ERR(task)) {
9450                 ret = PTR_ERR(task);
9451                 goto out;
9452         }
9453         ret = rpc_wait_for_completion_task(task);
9454         if (!ret)
9455                 ret = task->tk_status;
9456         rpc_put_task(task);
9457 out:
9458         dprintk("<-- %s status=%d\n", __func__, ret);
9459         return ret;
9460 }
9461
9462 struct nfs4_reclaim_complete_data {
9463         struct nfs_client *clp;
9464         struct nfs41_reclaim_complete_args arg;
9465         struct nfs41_reclaim_complete_res res;
9466 };
9467
9468 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9469 {
9470         struct nfs4_reclaim_complete_data *calldata = data;
9471
9472         nfs4_setup_sequence(calldata->clp,
9473                         &calldata->arg.seq_args,
9474                         &calldata->res.seq_res,
9475                         task);
9476 }
9477
9478 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9479 {
9480         switch(task->tk_status) {
9481         case 0:
9482                 wake_up_all(&clp->cl_lock_waitq);
9483                 fallthrough;
9484         case -NFS4ERR_COMPLETE_ALREADY:
9485         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9486                 break;
9487         case -NFS4ERR_DELAY:
9488                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9489                 fallthrough;
9490         case -NFS4ERR_RETRY_UNCACHED_REP:
9491         case -EACCES:
9492                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9493                         __func__, task->tk_status, clp->cl_hostname);
9494                 return -EAGAIN;
9495         case -NFS4ERR_BADSESSION:
9496         case -NFS4ERR_DEADSESSION:
9497         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9498                 break;
9499         default:
9500                 nfs4_schedule_lease_recovery(clp);
9501         }
9502         return 0;
9503 }
9504
9505 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9506 {
9507         struct nfs4_reclaim_complete_data *calldata = data;
9508         struct nfs_client *clp = calldata->clp;
9509         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9510
9511         if (!nfs41_sequence_done(task, res))
9512                 return;
9513
9514         trace_nfs4_reclaim_complete(clp, task->tk_status);
9515         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9516                 rpc_restart_call_prepare(task);
9517                 return;
9518         }
9519 }
9520
9521 static void nfs4_free_reclaim_complete_data(void *data)
9522 {
9523         struct nfs4_reclaim_complete_data *calldata = data;
9524
9525         kfree(calldata);
9526 }
9527
9528 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9529         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9530         .rpc_call_done = nfs4_reclaim_complete_done,
9531         .rpc_release = nfs4_free_reclaim_complete_data,
9532 };
9533
9534 /*
9535  * Issue a global reclaim complete.
9536  */
9537 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9538                 const struct cred *cred)
9539 {
9540         struct nfs4_reclaim_complete_data *calldata;
9541         struct rpc_message msg = {
9542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9543                 .rpc_cred = cred,
9544         };
9545         struct rpc_task_setup task_setup_data = {
9546                 .rpc_client = clp->cl_rpcclient,
9547                 .rpc_message = &msg,
9548                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9549                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9550         };
9551         int status = -ENOMEM;
9552
9553         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9554         if (calldata == NULL)
9555                 goto out;
9556         calldata->clp = clp;
9557         calldata->arg.one_fs = 0;
9558
9559         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9560         msg.rpc_argp = &calldata->arg;
9561         msg.rpc_resp = &calldata->res;
9562         task_setup_data.callback_data = calldata;
9563         status = nfs4_call_sync_custom(&task_setup_data);
9564 out:
9565         dprintk("<-- %s status=%d\n", __func__, status);
9566         return status;
9567 }
9568
9569 static void
9570 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9571 {
9572         struct nfs4_layoutget *lgp = calldata;
9573         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9574
9575         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9576                                 &lgp->res.seq_res, task);
9577 }
9578
9579 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9580 {
9581         struct nfs4_layoutget *lgp = calldata;
9582
9583         nfs41_sequence_process(task, &lgp->res.seq_res);
9584 }
9585
9586 static int
9587 nfs4_layoutget_handle_exception(struct rpc_task *task,
9588                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9589 {
9590         struct inode *inode = lgp->args.inode;
9591         struct nfs_server *server = NFS_SERVER(inode);
9592         struct pnfs_layout_hdr *lo = lgp->lo;
9593         int nfs4err = task->tk_status;
9594         int err, status = 0;
9595         LIST_HEAD(head);
9596
9597         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9598
9599         nfs4_sequence_free_slot(&lgp->res.seq_res);
9600
9601         switch (nfs4err) {
9602         case 0:
9603                 goto out;
9604
9605         /*
9606          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9607          * on the file. set tk_status to -ENODATA to tell upper layer to
9608          * retry go inband.
9609          */
9610         case -NFS4ERR_LAYOUTUNAVAILABLE:
9611                 status = -ENODATA;
9612                 goto out;
9613         /*
9614          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9615          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9616          */
9617         case -NFS4ERR_BADLAYOUT:
9618                 status = -EOVERFLOW;
9619                 goto out;
9620         /*
9621          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9622          * (or clients) writing to the same RAID stripe except when
9623          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9624          *
9625          * Treat it like we would RECALLCONFLICT -- we retry for a little
9626          * while, and then eventually give up.
9627          */
9628         case -NFS4ERR_LAYOUTTRYLATER:
9629                 if (lgp->args.minlength == 0) {
9630                         status = -EOVERFLOW;
9631                         goto out;
9632                 }
9633                 status = -EBUSY;
9634                 break;
9635         case -NFS4ERR_RECALLCONFLICT:
9636                 status = -ERECALLCONFLICT;
9637                 break;
9638         case -NFS4ERR_DELEG_REVOKED:
9639         case -NFS4ERR_ADMIN_REVOKED:
9640         case -NFS4ERR_EXPIRED:
9641         case -NFS4ERR_BAD_STATEID:
9642                 exception->timeout = 0;
9643                 spin_lock(&inode->i_lock);
9644                 /* If the open stateid was bad, then recover it. */
9645                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9646                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9647                         spin_unlock(&inode->i_lock);
9648                         exception->state = lgp->args.ctx->state;
9649                         exception->stateid = &lgp->args.stateid;
9650                         break;
9651                 }
9652
9653                 /*
9654                  * Mark the bad layout state as invalid, then retry
9655                  */
9656                 pnfs_mark_layout_stateid_invalid(lo, &head);
9657                 spin_unlock(&inode->i_lock);
9658                 nfs_commit_inode(inode, 0);
9659                 pnfs_free_lseg_list(&head);
9660                 status = -EAGAIN;
9661                 goto out;
9662         }
9663
9664         err = nfs4_handle_exception(server, nfs4err, exception);
9665         if (!status) {
9666                 if (exception->retry)
9667                         status = -EAGAIN;
9668                 else
9669                         status = err;
9670         }
9671 out:
9672         return status;
9673 }
9674
9675 size_t max_response_pages(struct nfs_server *server)
9676 {
9677         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9678         return nfs_page_array_len(0, max_resp_sz);
9679 }
9680
9681 static void nfs4_layoutget_release(void *calldata)
9682 {
9683         struct nfs4_layoutget *lgp = calldata;
9684
9685         nfs4_sequence_free_slot(&lgp->res.seq_res);
9686         pnfs_layoutget_free(lgp);
9687 }
9688
9689 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9690         .rpc_call_prepare = nfs4_layoutget_prepare,
9691         .rpc_call_done = nfs4_layoutget_done,
9692         .rpc_release = nfs4_layoutget_release,
9693 };
9694
9695 struct pnfs_layout_segment *
9696 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9697 {
9698         struct inode *inode = lgp->args.inode;
9699         struct nfs_server *server = NFS_SERVER(inode);
9700         struct rpc_task *task;
9701         struct rpc_message msg = {
9702                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9703                 .rpc_argp = &lgp->args,
9704                 .rpc_resp = &lgp->res,
9705                 .rpc_cred = lgp->cred,
9706         };
9707         struct rpc_task_setup task_setup_data = {
9708                 .rpc_client = server->client,
9709                 .rpc_message = &msg,
9710                 .callback_ops = &nfs4_layoutget_call_ops,
9711                 .callback_data = lgp,
9712                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9713                          RPC_TASK_MOVEABLE,
9714         };
9715         struct pnfs_layout_segment *lseg = NULL;
9716         struct nfs4_exception exception = {
9717                 .inode = inode,
9718                 .timeout = *timeout,
9719         };
9720         int status = 0;
9721
9722         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9723
9724         task = rpc_run_task(&task_setup_data);
9725         if (IS_ERR(task))
9726                 return ERR_CAST(task);
9727
9728         status = rpc_wait_for_completion_task(task);
9729         if (status != 0)
9730                 goto out;
9731
9732         if (task->tk_status < 0) {
9733                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9734                 *timeout = exception.timeout;
9735         } else if (lgp->res.layoutp->len == 0) {
9736                 status = -EAGAIN;
9737                 *timeout = nfs4_update_delay(&exception.timeout);
9738         } else
9739                 lseg = pnfs_layout_process(lgp);
9740 out:
9741         trace_nfs4_layoutget(lgp->args.ctx,
9742                         &lgp->args.range,
9743                         &lgp->res.range,
9744                         &lgp->res.stateid,
9745                         status);
9746
9747         rpc_put_task(task);
9748         dprintk("<-- %s status=%d\n", __func__, status);
9749         if (status)
9750                 return ERR_PTR(status);
9751         return lseg;
9752 }
9753
9754 static void
9755 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9756 {
9757         struct nfs4_layoutreturn *lrp = calldata;
9758
9759         nfs4_setup_sequence(lrp->clp,
9760                         &lrp->args.seq_args,
9761                         &lrp->res.seq_res,
9762                         task);
9763         if (!pnfs_layout_is_valid(lrp->args.layout))
9764                 rpc_exit(task, 0);
9765 }
9766
9767 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9768 {
9769         struct nfs4_layoutreturn *lrp = calldata;
9770         struct nfs_server *server;
9771
9772         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9773                 return;
9774
9775         /*
9776          * Was there an RPC level error? Assume the call succeeded,
9777          * and that we need to release the layout
9778          */
9779         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9780                 lrp->res.lrs_present = 0;
9781                 return;
9782         }
9783
9784         server = NFS_SERVER(lrp->args.inode);
9785         switch (task->tk_status) {
9786         case -NFS4ERR_OLD_STATEID:
9787                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9788                                         &lrp->args.range,
9789                                         lrp->args.inode))
9790                         goto out_restart;
9791                 fallthrough;
9792         default:
9793                 task->tk_status = 0;
9794                 fallthrough;
9795         case 0:
9796                 break;
9797         case -NFS4ERR_DELAY:
9798                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9799                         break;
9800                 goto out_restart;
9801         }
9802         return;
9803 out_restart:
9804         task->tk_status = 0;
9805         nfs4_sequence_free_slot(&lrp->res.seq_res);
9806         rpc_restart_call_prepare(task);
9807 }
9808
9809 static void nfs4_layoutreturn_release(void *calldata)
9810 {
9811         struct nfs4_layoutreturn *lrp = calldata;
9812         struct pnfs_layout_hdr *lo = lrp->args.layout;
9813
9814         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9815                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9816         nfs4_sequence_free_slot(&lrp->res.seq_res);
9817         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9818                 lrp->ld_private.ops->free(&lrp->ld_private);
9819         pnfs_put_layout_hdr(lrp->args.layout);
9820         nfs_iput_and_deactive(lrp->inode);
9821         put_cred(lrp->cred);
9822         kfree(calldata);
9823 }
9824
9825 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9826         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9827         .rpc_call_done = nfs4_layoutreturn_done,
9828         .rpc_release = nfs4_layoutreturn_release,
9829 };
9830
9831 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9832 {
9833         struct rpc_task *task;
9834         struct rpc_message msg = {
9835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9836                 .rpc_argp = &lrp->args,
9837                 .rpc_resp = &lrp->res,
9838                 .rpc_cred = lrp->cred,
9839         };
9840         struct rpc_task_setup task_setup_data = {
9841                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9842                 .rpc_message = &msg,
9843                 .callback_ops = &nfs4_layoutreturn_call_ops,
9844                 .callback_data = lrp,
9845                 .flags = RPC_TASK_MOVEABLE,
9846         };
9847         int status = 0;
9848
9849         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9850                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9851                         &task_setup_data.rpc_client, &msg);
9852
9853         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9854         if (!sync) {
9855                 if (!lrp->inode) {
9856                         nfs4_layoutreturn_release(lrp);
9857                         return -EAGAIN;
9858                 }
9859                 task_setup_data.flags |= RPC_TASK_ASYNC;
9860         }
9861         if (!lrp->inode)
9862                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9863                                    1);
9864         else
9865                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9866                                    0);
9867         task = rpc_run_task(&task_setup_data);
9868         if (IS_ERR(task))
9869                 return PTR_ERR(task);
9870         if (sync)
9871                 status = task->tk_status;
9872         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9873         dprintk("<-- %s status=%d\n", __func__, status);
9874         rpc_put_task(task);
9875         return status;
9876 }
9877
9878 static int
9879 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9880                 struct pnfs_device *pdev,
9881                 const struct cred *cred)
9882 {
9883         struct nfs4_getdeviceinfo_args args = {
9884                 .pdev = pdev,
9885                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9886                         NOTIFY_DEVICEID4_DELETE,
9887         };
9888         struct nfs4_getdeviceinfo_res res = {
9889                 .pdev = pdev,
9890         };
9891         struct rpc_message msg = {
9892                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9893                 .rpc_argp = &args,
9894                 .rpc_resp = &res,
9895                 .rpc_cred = cred,
9896         };
9897         int status;
9898
9899         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9900         if (res.notification & ~args.notify_types)
9901                 dprintk("%s: unsupported notification\n", __func__);
9902         if (res.notification != args.notify_types)
9903                 pdev->nocache = 1;
9904
9905         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9906
9907         dprintk("<-- %s status=%d\n", __func__, status);
9908
9909         return status;
9910 }
9911
9912 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9913                 struct pnfs_device *pdev,
9914                 const struct cred *cred)
9915 {
9916         struct nfs4_exception exception = { };
9917         int err;
9918
9919         do {
9920                 err = nfs4_handle_exception(server,
9921                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9922                                         &exception);
9923         } while (exception.retry);
9924         return err;
9925 }
9926 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9927
9928 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9929 {
9930         struct nfs4_layoutcommit_data *data = calldata;
9931         struct nfs_server *server = NFS_SERVER(data->args.inode);
9932
9933         nfs4_setup_sequence(server->nfs_client,
9934                         &data->args.seq_args,
9935                         &data->res.seq_res,
9936                         task);
9937 }
9938
9939 static void
9940 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9941 {
9942         struct nfs4_layoutcommit_data *data = calldata;
9943         struct nfs_server *server = NFS_SERVER(data->args.inode);
9944
9945         if (!nfs41_sequence_done(task, &data->res.seq_res))
9946                 return;
9947
9948         switch (task->tk_status) { /* Just ignore these failures */
9949         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9950         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9951         case -NFS4ERR_BADLAYOUT:     /* no layout */
9952         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9953                 task->tk_status = 0;
9954                 break;
9955         case 0:
9956                 break;
9957         default:
9958                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9959                         rpc_restart_call_prepare(task);
9960                         return;
9961                 }
9962         }
9963 }
9964
9965 static void nfs4_layoutcommit_release(void *calldata)
9966 {
9967         struct nfs4_layoutcommit_data *data = calldata;
9968
9969         pnfs_cleanup_layoutcommit(data);
9970         nfs_post_op_update_inode_force_wcc(data->args.inode,
9971                                            data->res.fattr);
9972         put_cred(data->cred);
9973         nfs_iput_and_deactive(data->inode);
9974         kfree(data);
9975 }
9976
9977 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9978         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9979         .rpc_call_done = nfs4_layoutcommit_done,
9980         .rpc_release = nfs4_layoutcommit_release,
9981 };
9982
9983 int
9984 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9985 {
9986         struct rpc_message msg = {
9987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9988                 .rpc_argp = &data->args,
9989                 .rpc_resp = &data->res,
9990                 .rpc_cred = data->cred,
9991         };
9992         struct rpc_task_setup task_setup_data = {
9993                 .task = &data->task,
9994                 .rpc_client = NFS_CLIENT(data->args.inode),
9995                 .rpc_message = &msg,
9996                 .callback_ops = &nfs4_layoutcommit_ops,
9997                 .callback_data = data,
9998                 .flags = RPC_TASK_MOVEABLE,
9999         };
10000         struct rpc_task *task;
10001         int status = 0;
10002
10003         dprintk("NFS: initiating layoutcommit call. sync %d "
10004                 "lbw: %llu inode %lu\n", sync,
10005                 data->args.lastbytewritten,
10006                 data->args.inode->i_ino);
10007
10008         if (!sync) {
10009                 data->inode = nfs_igrab_and_active(data->args.inode);
10010                 if (data->inode == NULL) {
10011                         nfs4_layoutcommit_release(data);
10012                         return -EAGAIN;
10013                 }
10014                 task_setup_data.flags = RPC_TASK_ASYNC;
10015         }
10016         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10017         task = rpc_run_task(&task_setup_data);
10018         if (IS_ERR(task))
10019                 return PTR_ERR(task);
10020         if (sync)
10021                 status = task->tk_status;
10022         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10023         dprintk("%s: status %d\n", __func__, status);
10024         rpc_put_task(task);
10025         return status;
10026 }
10027
10028 /*
10029  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10030  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10031  */
10032 static int
10033 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10034                     struct nfs_fsinfo *info,
10035                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10036 {
10037         struct nfs41_secinfo_no_name_args args = {
10038                 .style = SECINFO_STYLE_CURRENT_FH,
10039         };
10040         struct nfs4_secinfo_res res = {
10041                 .flavors = flavors,
10042         };
10043         struct rpc_message msg = {
10044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10045                 .rpc_argp = &args,
10046                 .rpc_resp = &res,
10047         };
10048         struct nfs4_call_sync_data data = {
10049                 .seq_server = server,
10050                 .seq_args = &args.seq_args,
10051                 .seq_res = &res.seq_res,
10052         };
10053         struct rpc_task_setup task_setup = {
10054                 .rpc_client = server->client,
10055                 .rpc_message = &msg,
10056                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10057                 .callback_data = &data,
10058                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10059         };
10060         const struct cred *cred = NULL;
10061         int status;
10062
10063         if (use_integrity) {
10064                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10065
10066                 cred = nfs4_get_clid_cred(server->nfs_client);
10067                 msg.rpc_cred = cred;
10068         }
10069
10070         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10071         status = nfs4_call_sync_custom(&task_setup);
10072         dprintk("<-- %s status=%d\n", __func__, status);
10073
10074         put_cred(cred);
10075
10076         return status;
10077 }
10078
10079 static int
10080 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10081                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10082 {
10083         struct nfs4_exception exception = {
10084                 .interruptible = true,
10085         };
10086         int err;
10087         do {
10088                 /* first try using integrity protection */
10089                 err = -NFS4ERR_WRONGSEC;
10090
10091                 /* try to use integrity protection with machine cred */
10092                 if (_nfs4_is_integrity_protected(server->nfs_client))
10093                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10094                                                           flavors, true);
10095
10096                 /*
10097                  * if unable to use integrity protection, or SECINFO with
10098                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10099                  * disallowed by spec, but exists in deployed servers) use
10100                  * the current filesystem's rpc_client and the user cred.
10101                  */
10102                 if (err == -NFS4ERR_WRONGSEC)
10103                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10104                                                           flavors, false);
10105
10106                 switch (err) {
10107                 case 0:
10108                 case -NFS4ERR_WRONGSEC:
10109                 case -ENOTSUPP:
10110                         goto out;
10111                 default:
10112                         err = nfs4_handle_exception(server, err, &exception);
10113                 }
10114         } while (exception.retry);
10115 out:
10116         return err;
10117 }
10118
10119 static int
10120 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10121                     struct nfs_fsinfo *info)
10122 {
10123         int err;
10124         struct page *page;
10125         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10126         struct nfs4_secinfo_flavors *flavors;
10127         struct nfs4_secinfo4 *secinfo;
10128         int i;
10129
10130         page = alloc_page(GFP_KERNEL);
10131         if (!page) {
10132                 err = -ENOMEM;
10133                 goto out;
10134         }
10135
10136         flavors = page_address(page);
10137         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10138
10139         /*
10140          * Fall back on "guess and check" method if
10141          * the server doesn't support SECINFO_NO_NAME
10142          */
10143         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10144                 err = nfs4_find_root_sec(server, fhandle, info);
10145                 goto out_freepage;
10146         }
10147         if (err)
10148                 goto out_freepage;
10149
10150         for (i = 0; i < flavors->num_flavors; i++) {
10151                 secinfo = &flavors->flavors[i];
10152
10153                 switch (secinfo->flavor) {
10154                 case RPC_AUTH_NULL:
10155                 case RPC_AUTH_UNIX:
10156                 case RPC_AUTH_GSS:
10157                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10158                                         &secinfo->flavor_info);
10159                         break;
10160                 default:
10161                         flavor = RPC_AUTH_MAXFLAVOR;
10162                         break;
10163                 }
10164
10165                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10166                         flavor = RPC_AUTH_MAXFLAVOR;
10167
10168                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10169                         err = nfs4_lookup_root_sec(server, fhandle,
10170                                                    info, flavor);
10171                         if (!err)
10172                                 break;
10173                 }
10174         }
10175
10176         if (flavor == RPC_AUTH_MAXFLAVOR)
10177                 err = -EPERM;
10178
10179 out_freepage:
10180         put_page(page);
10181         if (err == -EACCES)
10182                 return -EPERM;
10183 out:
10184         return err;
10185 }
10186
10187 static int _nfs41_test_stateid(struct nfs_server *server,
10188                 nfs4_stateid *stateid,
10189                 const struct cred *cred)
10190 {
10191         int status;
10192         struct nfs41_test_stateid_args args = {
10193                 .stateid = stateid,
10194         };
10195         struct nfs41_test_stateid_res res;
10196         struct rpc_message msg = {
10197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10198                 .rpc_argp = &args,
10199                 .rpc_resp = &res,
10200                 .rpc_cred = cred,
10201         };
10202         struct rpc_clnt *rpc_client = server->client;
10203
10204         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10205                 &rpc_client, &msg);
10206
10207         dprintk("NFS call  test_stateid %p\n", stateid);
10208         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10209         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10210                         &args.seq_args, &res.seq_res);
10211         if (status != NFS_OK) {
10212                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10213                 return status;
10214         }
10215         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10216         return -res.status;
10217 }
10218
10219 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10220                 int err, struct nfs4_exception *exception)
10221 {
10222         exception->retry = 0;
10223         switch(err) {
10224         case -NFS4ERR_DELAY:
10225         case -NFS4ERR_RETRY_UNCACHED_REP:
10226                 nfs4_handle_exception(server, err, exception);
10227                 break;
10228         case -NFS4ERR_BADSESSION:
10229         case -NFS4ERR_BADSLOT:
10230         case -NFS4ERR_BAD_HIGH_SLOT:
10231         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10232         case -NFS4ERR_DEADSESSION:
10233                 nfs4_do_handle_exception(server, err, exception);
10234         }
10235 }
10236
10237 /**
10238  * nfs41_test_stateid - perform a TEST_STATEID operation
10239  *
10240  * @server: server / transport on which to perform the operation
10241  * @stateid: state ID to test
10242  * @cred: credential
10243  *
10244  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10245  * Otherwise a negative NFS4ERR value is returned if the operation
10246  * failed or the state ID is not currently valid.
10247  */
10248 static int nfs41_test_stateid(struct nfs_server *server,
10249                 nfs4_stateid *stateid,
10250                 const struct cred *cred)
10251 {
10252         struct nfs4_exception exception = {
10253                 .interruptible = true,
10254         };
10255         int err;
10256         do {
10257                 err = _nfs41_test_stateid(server, stateid, cred);
10258                 nfs4_handle_delay_or_session_error(server, err, &exception);
10259         } while (exception.retry);
10260         return err;
10261 }
10262
10263 struct nfs_free_stateid_data {
10264         struct nfs_server *server;
10265         struct nfs41_free_stateid_args args;
10266         struct nfs41_free_stateid_res res;
10267 };
10268
10269 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10270 {
10271         struct nfs_free_stateid_data *data = calldata;
10272         nfs4_setup_sequence(data->server->nfs_client,
10273                         &data->args.seq_args,
10274                         &data->res.seq_res,
10275                         task);
10276 }
10277
10278 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10279 {
10280         struct nfs_free_stateid_data *data = calldata;
10281
10282         nfs41_sequence_done(task, &data->res.seq_res);
10283
10284         switch (task->tk_status) {
10285         case -NFS4ERR_DELAY:
10286                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10287                         rpc_restart_call_prepare(task);
10288         }
10289 }
10290
10291 static void nfs41_free_stateid_release(void *calldata)
10292 {
10293         struct nfs_free_stateid_data *data = calldata;
10294         struct nfs_client *clp = data->server->nfs_client;
10295
10296         nfs_put_client(clp);
10297         kfree(calldata);
10298 }
10299
10300 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10301         .rpc_call_prepare = nfs41_free_stateid_prepare,
10302         .rpc_call_done = nfs41_free_stateid_done,
10303         .rpc_release = nfs41_free_stateid_release,
10304 };
10305
10306 /**
10307  * nfs41_free_stateid - perform a FREE_STATEID operation
10308  *
10309  * @server: server / transport on which to perform the operation
10310  * @stateid: state ID to release
10311  * @cred: credential
10312  * @privileged: set to true if this call needs to be privileged
10313  *
10314  * Note: this function is always asynchronous.
10315  */
10316 static int nfs41_free_stateid(struct nfs_server *server,
10317                 const nfs4_stateid *stateid,
10318                 const struct cred *cred,
10319                 bool privileged)
10320 {
10321         struct rpc_message msg = {
10322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10323                 .rpc_cred = cred,
10324         };
10325         struct rpc_task_setup task_setup = {
10326                 .rpc_client = server->client,
10327                 .rpc_message = &msg,
10328                 .callback_ops = &nfs41_free_stateid_ops,
10329                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10330         };
10331         struct nfs_free_stateid_data *data;
10332         struct rpc_task *task;
10333         struct nfs_client *clp = server->nfs_client;
10334
10335         if (!refcount_inc_not_zero(&clp->cl_count))
10336                 return -EIO;
10337
10338         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10339                 &task_setup.rpc_client, &msg);
10340
10341         dprintk("NFS call  free_stateid %p\n", stateid);
10342         data = kmalloc(sizeof(*data), GFP_KERNEL);
10343         if (!data)
10344                 return -ENOMEM;
10345         data->server = server;
10346         nfs4_stateid_copy(&data->args.stateid, stateid);
10347
10348         task_setup.callback_data = data;
10349
10350         msg.rpc_argp = &data->args;
10351         msg.rpc_resp = &data->res;
10352         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10353         task = rpc_run_task(&task_setup);
10354         if (IS_ERR(task))
10355                 return PTR_ERR(task);
10356         rpc_put_task(task);
10357         return 0;
10358 }
10359
10360 static void
10361 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10362 {
10363         const struct cred *cred = lsp->ls_state->owner->so_cred;
10364
10365         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10366         nfs4_free_lock_state(server, lsp);
10367 }
10368
10369 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10370                 const nfs4_stateid *s2)
10371 {
10372         if (s1->type != s2->type)
10373                 return false;
10374
10375         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10376                 return false;
10377
10378         if (s1->seqid == s2->seqid)
10379                 return true;
10380
10381         return s1->seqid == 0 || s2->seqid == 0;
10382 }
10383
10384 #endif /* CONFIG_NFS_V4_1 */
10385
10386 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10387                 const nfs4_stateid *s2)
10388 {
10389         return nfs4_stateid_match(s1, s2);
10390 }
10391
10392
10393 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10394         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10395         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10396         .recover_open   = nfs4_open_reclaim,
10397         .recover_lock   = nfs4_lock_reclaim,
10398         .establish_clid = nfs4_init_clientid,
10399         .detect_trunking = nfs40_discover_server_trunking,
10400 };
10401
10402 #if defined(CONFIG_NFS_V4_1)
10403 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10404         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10405         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10406         .recover_open   = nfs4_open_reclaim,
10407         .recover_lock   = nfs4_lock_reclaim,
10408         .establish_clid = nfs41_init_clientid,
10409         .reclaim_complete = nfs41_proc_reclaim_complete,
10410         .detect_trunking = nfs41_discover_server_trunking,
10411 };
10412 #endif /* CONFIG_NFS_V4_1 */
10413
10414 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10415         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10416         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10417         .recover_open   = nfs40_open_expired,
10418         .recover_lock   = nfs4_lock_expired,
10419         .establish_clid = nfs4_init_clientid,
10420 };
10421
10422 #if defined(CONFIG_NFS_V4_1)
10423 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10424         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10425         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10426         .recover_open   = nfs41_open_expired,
10427         .recover_lock   = nfs41_lock_expired,
10428         .establish_clid = nfs41_init_clientid,
10429 };
10430 #endif /* CONFIG_NFS_V4_1 */
10431
10432 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10433         .sched_state_renewal = nfs4_proc_async_renew,
10434         .get_state_renewal_cred = nfs4_get_renew_cred,
10435         .renew_lease = nfs4_proc_renew,
10436 };
10437
10438 #if defined(CONFIG_NFS_V4_1)
10439 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10440         .sched_state_renewal = nfs41_proc_async_sequence,
10441         .get_state_renewal_cred = nfs4_get_machine_cred,
10442         .renew_lease = nfs4_proc_sequence,
10443 };
10444 #endif
10445
10446 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10447         .get_locations = _nfs40_proc_get_locations,
10448         .fsid_present = _nfs40_proc_fsid_present,
10449 };
10450
10451 #if defined(CONFIG_NFS_V4_1)
10452 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10453         .get_locations = _nfs41_proc_get_locations,
10454         .fsid_present = _nfs41_proc_fsid_present,
10455 };
10456 #endif  /* CONFIG_NFS_V4_1 */
10457
10458 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10459         .minor_version = 0,
10460         .init_caps = NFS_CAP_READDIRPLUS
10461                 | NFS_CAP_ATOMIC_OPEN
10462                 | NFS_CAP_POSIX_LOCK,
10463         .init_client = nfs40_init_client,
10464         .shutdown_client = nfs40_shutdown_client,
10465         .match_stateid = nfs4_match_stateid,
10466         .find_root_sec = nfs4_find_root_sec,
10467         .free_lock_state = nfs4_release_lockowner,
10468         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10469         .alloc_seqid = nfs_alloc_seqid,
10470         .call_sync_ops = &nfs40_call_sync_ops,
10471         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10472         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10473         .state_renewal_ops = &nfs40_state_renewal_ops,
10474         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10475 };
10476
10477 #if defined(CONFIG_NFS_V4_1)
10478 static struct nfs_seqid *
10479 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10480 {
10481         return NULL;
10482 }
10483
10484 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10485         .minor_version = 1,
10486         .init_caps = NFS_CAP_READDIRPLUS
10487                 | NFS_CAP_ATOMIC_OPEN
10488                 | NFS_CAP_POSIX_LOCK
10489                 | NFS_CAP_STATEID_NFSV41
10490                 | NFS_CAP_ATOMIC_OPEN_V1
10491                 | NFS_CAP_LGOPEN
10492                 | NFS_CAP_MOVEABLE,
10493         .init_client = nfs41_init_client,
10494         .shutdown_client = nfs41_shutdown_client,
10495         .match_stateid = nfs41_match_stateid,
10496         .find_root_sec = nfs41_find_root_sec,
10497         .free_lock_state = nfs41_free_lock_state,
10498         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10499         .alloc_seqid = nfs_alloc_no_seqid,
10500         .session_trunk = nfs4_test_session_trunk,
10501         .call_sync_ops = &nfs41_call_sync_ops,
10502         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10503         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10504         .state_renewal_ops = &nfs41_state_renewal_ops,
10505         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10506 };
10507 #endif
10508
10509 #if defined(CONFIG_NFS_V4_2)
10510 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10511         .minor_version = 2,
10512         .init_caps = NFS_CAP_READDIRPLUS
10513                 | NFS_CAP_ATOMIC_OPEN
10514                 | NFS_CAP_POSIX_LOCK
10515                 | NFS_CAP_STATEID_NFSV41
10516                 | NFS_CAP_ATOMIC_OPEN_V1
10517                 | NFS_CAP_LGOPEN
10518                 | NFS_CAP_ALLOCATE
10519                 | NFS_CAP_COPY
10520                 | NFS_CAP_OFFLOAD_CANCEL
10521                 | NFS_CAP_COPY_NOTIFY
10522                 | NFS_CAP_DEALLOCATE
10523                 | NFS_CAP_SEEK
10524                 | NFS_CAP_LAYOUTSTATS
10525                 | NFS_CAP_CLONE
10526                 | NFS_CAP_LAYOUTERROR
10527                 | NFS_CAP_READ_PLUS
10528                 | NFS_CAP_MOVEABLE,
10529         .init_client = nfs41_init_client,
10530         .shutdown_client = nfs41_shutdown_client,
10531         .match_stateid = nfs41_match_stateid,
10532         .find_root_sec = nfs41_find_root_sec,
10533         .free_lock_state = nfs41_free_lock_state,
10534         .call_sync_ops = &nfs41_call_sync_ops,
10535         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10536         .alloc_seqid = nfs_alloc_no_seqid,
10537         .session_trunk = nfs4_test_session_trunk,
10538         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10539         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10540         .state_renewal_ops = &nfs41_state_renewal_ops,
10541         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10542 };
10543 #endif
10544
10545 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10546         [0] = &nfs_v4_0_minor_ops,
10547 #if defined(CONFIG_NFS_V4_1)
10548         [1] = &nfs_v4_1_minor_ops,
10549 #endif
10550 #if defined(CONFIG_NFS_V4_2)
10551         [2] = &nfs_v4_2_minor_ops,
10552 #endif
10553 };
10554
10555 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10556 {
10557         ssize_t error, error2, error3;
10558
10559         error = generic_listxattr(dentry, list, size);
10560         if (error < 0)
10561                 return error;
10562         if (list) {
10563                 list += error;
10564                 size -= error;
10565         }
10566
10567         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10568         if (error2 < 0)
10569                 return error2;
10570
10571         if (list) {
10572                 list += error2;
10573                 size -= error2;
10574         }
10575
10576         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10577         if (error3 < 0)
10578                 return error3;
10579
10580         return error + error2 + error3;
10581 }
10582
10583 static void nfs4_enable_swap(struct inode *inode)
10584 {
10585         /* The state manager thread must always be running.
10586          * It will notice the client is a swapper, and stay put.
10587          */
10588         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10589
10590         nfs4_schedule_state_manager(clp);
10591 }
10592
10593 static void nfs4_disable_swap(struct inode *inode)
10594 {
10595         /* The state manager thread will now exit once it is
10596          * woken.
10597          */
10598         wake_up_var(&NFS_SERVER(inode)->nfs_client->cl_state);
10599 }
10600
10601 static const struct inode_operations nfs4_dir_inode_operations = {
10602         .create         = nfs_create,
10603         .lookup         = nfs_lookup,
10604         .atomic_open    = nfs_atomic_open,
10605         .link           = nfs_link,
10606         .unlink         = nfs_unlink,
10607         .symlink        = nfs_symlink,
10608         .mkdir          = nfs_mkdir,
10609         .rmdir          = nfs_rmdir,
10610         .mknod          = nfs_mknod,
10611         .rename         = nfs_rename,
10612         .permission     = nfs_permission,
10613         .getattr        = nfs_getattr,
10614         .setattr        = nfs_setattr,
10615         .listxattr      = nfs4_listxattr,
10616 };
10617
10618 static const struct inode_operations nfs4_file_inode_operations = {
10619         .permission     = nfs_permission,
10620         .getattr        = nfs_getattr,
10621         .setattr        = nfs_setattr,
10622         .listxattr      = nfs4_listxattr,
10623 };
10624
10625 const struct nfs_rpc_ops nfs_v4_clientops = {
10626         .version        = 4,                    /* protocol version */
10627         .dentry_ops     = &nfs4_dentry_operations,
10628         .dir_inode_ops  = &nfs4_dir_inode_operations,
10629         .file_inode_ops = &nfs4_file_inode_operations,
10630         .file_ops       = &nfs4_file_operations,
10631         .getroot        = nfs4_proc_get_root,
10632         .submount       = nfs4_submount,
10633         .try_get_tree   = nfs4_try_get_tree,
10634         .getattr        = nfs4_proc_getattr,
10635         .setattr        = nfs4_proc_setattr,
10636         .lookup         = nfs4_proc_lookup,
10637         .lookupp        = nfs4_proc_lookupp,
10638         .access         = nfs4_proc_access,
10639         .readlink       = nfs4_proc_readlink,
10640         .create         = nfs4_proc_create,
10641         .remove         = nfs4_proc_remove,
10642         .unlink_setup   = nfs4_proc_unlink_setup,
10643         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10644         .unlink_done    = nfs4_proc_unlink_done,
10645         .rename_setup   = nfs4_proc_rename_setup,
10646         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10647         .rename_done    = nfs4_proc_rename_done,
10648         .link           = nfs4_proc_link,
10649         .symlink        = nfs4_proc_symlink,
10650         .mkdir          = nfs4_proc_mkdir,
10651         .rmdir          = nfs4_proc_rmdir,
10652         .readdir        = nfs4_proc_readdir,
10653         .mknod          = nfs4_proc_mknod,
10654         .statfs         = nfs4_proc_statfs,
10655         .fsinfo         = nfs4_proc_fsinfo,
10656         .pathconf       = nfs4_proc_pathconf,
10657         .set_capabilities = nfs4_server_capabilities,
10658         .decode_dirent  = nfs4_decode_dirent,
10659         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10660         .read_setup     = nfs4_proc_read_setup,
10661         .read_done      = nfs4_read_done,
10662         .write_setup    = nfs4_proc_write_setup,
10663         .write_done     = nfs4_write_done,
10664         .commit_setup   = nfs4_proc_commit_setup,
10665         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10666         .commit_done    = nfs4_commit_done,
10667         .lock           = nfs4_proc_lock,
10668         .clear_acl_cache = nfs4_zap_acl_attr,
10669         .close_context  = nfs4_close_context,
10670         .open_context   = nfs4_atomic_open,
10671         .have_delegation = nfs4_have_delegation,
10672         .alloc_client   = nfs4_alloc_client,
10673         .init_client    = nfs4_init_client,
10674         .free_client    = nfs4_free_client,
10675         .create_server  = nfs4_create_server,
10676         .clone_server   = nfs_clone_server,
10677         .discover_trunking = nfs4_discover_trunking,
10678         .enable_swap    = nfs4_enable_swap,
10679         .disable_swap   = nfs4_disable_swap,
10680 };
10681
10682 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10683         .name   = XATTR_NAME_NFSV4_ACL,
10684         .list   = nfs4_xattr_list_nfs4_acl,
10685         .get    = nfs4_xattr_get_nfs4_acl,
10686         .set    = nfs4_xattr_set_nfs4_acl,
10687 };
10688
10689 #if defined(CONFIG_NFS_V4_1)
10690 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10691         .name   = XATTR_NAME_NFSV4_DACL,
10692         .list   = nfs4_xattr_list_nfs4_dacl,
10693         .get    = nfs4_xattr_get_nfs4_dacl,
10694         .set    = nfs4_xattr_set_nfs4_dacl,
10695 };
10696
10697 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10698         .name   = XATTR_NAME_NFSV4_SACL,
10699         .list   = nfs4_xattr_list_nfs4_sacl,
10700         .get    = nfs4_xattr_get_nfs4_sacl,
10701         .set    = nfs4_xattr_set_nfs4_sacl,
10702 };
10703 #endif
10704
10705 #ifdef CONFIG_NFS_V4_2
10706 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10707         .prefix = XATTR_USER_PREFIX,
10708         .get    = nfs4_xattr_get_nfs4_user,
10709         .set    = nfs4_xattr_set_nfs4_user,
10710 };
10711 #endif
10712
10713 const struct xattr_handler *nfs4_xattr_handlers[] = {
10714         &nfs4_xattr_nfs4_acl_handler,
10715 #if defined(CONFIG_NFS_V4_1)
10716         &nfs4_xattr_nfs4_dacl_handler,
10717         &nfs4_xattr_nfs4_sacl_handler,
10718 #endif
10719 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10720         &nfs4_xattr_nfs4_label_handler,
10721 #endif
10722 #ifdef CONFIG_NFS_V4_2
10723         &nfs4_xattr_nfs4_user_handler,
10724 #endif
10725         NULL
10726 };